A president refuses to accept an election loss and watches on television as a crowd of his supporters storms the U.S. Capitol. A president shows signs of aging and performs badly at a nationally televised presidential debate. A president launches a series of armed attacks, then acts and speaks about them erratically, at times suggesting that the war already has been won; at others, that he nonetheless intends to destroy the civilization of the country that he has attacked.
In each of these episodes—spanning the three most recent administrations—members of Congress and others have called for a president to be declared unable to exercise his powers under Section 4 of the Twenty-Fifth Amendment. The United States will, in less than a month, be led by its second consecutive octogenarian president. But what exactly does Section 4 require or permit?
Although the Twenty-Fifth Amendment is nearly 60 years old, its most controversial provision, Section 4, has never been invoked. Section 4 authorizes just nine government officials—the vice president plus a majority of principal officers (eight of the 15 listed executive department heads)—to temporarily separate the president from his or her powers and duties by voting and transmitting to the Speaker of the House and President Pro Tempore of the Senate a written declaration that “the President is unable to discharge the powers and duties of his office.” The president would then have a right to challenge that declaration, and, if he or she did, but the vice president and Cabinet majority adhered to their belief that the president was unable, the two houses of Congress would each vote to resolve the dispute within three weeks. If each house sustains the vice president’s position by a two-thirds vote, the vice president would continue to serve as acting president while the president remained stripped of his or her powers. Thus, on a remarkably compressed constitutional timeline of less than one month, a sitting president could be separated from his or her powers. Yet this is a constitutional text that even many trained lawyers regularly misconstrue and a constitutional procedure that very few Americans understand.
To address this knowledge gap, in 2018, the Peter Gruber Rule of Law Clinic at Yale Law School authored a comprehensive, detailed “Reader’s Guide” explaining the Twenty-Fifth Amendment’s history, nature, and scope. A description of its major findings may be found here. Our goal was to carefully explain the Twenty-Fifth Amendment’s text and operation to laypeople and lawyers alike. In developing this guide over many months, we consulted closely with leading experts and studied as many sources as we could find, including text, legislative history, academic commentary, the limited number of existing relevant judicial analyses, and all significant past studies on the issues. Through these efforts, we developed what we hoped would be a single, authoritative document to provide a fair and thorough reading of all interpretive issues relating to the Twenty-Fifth Amendment.
Given the many intervening events, our Rule of Law Clinic has recently updated its Twenty-Fifth Amendment Guide to reflect subsequent developments arising during the Trump and Biden administrations—including, apparently under the first Trump administration, the only known instance of a principal officer (then-Education Secretary Betsy DeVos) reportedly expressing support for invoking Section 4 after the January 6, 2021 attack on the Capitol. As calls to invoke Section 4 proliferate, this blogpost distills: (1) the Reader’s Guide’s updated guidance on Section 4’s meaning; (2) its potential application today; (3) Section 4’s standard of inability, addressing some common misconceptions; and (4) suggested limits to the Twenty-Fifth Amendment’s applicability in times of national uncertainty.
Sections 3 and 4 of the Twenty-Fifth Amendment
A judgment of impeachment by the Senate removes a president from office. But the Constitution provides two other ways by which presidential powers and duties may be transferred from a sitting president to the vice president without removing the president from office. These means are described in Sections 3 and 4 of the Twenty-Fifth Amendment.
Temporary Voluntary Transfer of Power: Section 3 of the Amendment allows a president to temporarily transfer power to the vice president if the president is or will be “unable to discharge the powers and duties of his office.” Presidents have historically used this provision to transfer their power during medical procedures, for instance, those requiring general anesthesia. Upon recovery, they have reclaimed the duties and powers of their office simply by transmitting a written notification to the Speaker of the House and President Pro Tempore of the Senate that they have regained their ability to discharge the powers and duties of the office.
Involuntary Transfer: Section 4 provides a different, more politically charged mechanism for separating a president from the powers of the office. Although it has never been officially invoked, Section 4 allows a vice president and a majority of “principal officers of the executive departments” (a smaller group than those who meet as part of the whole Cabinet) to temporarily disempower a president who is “unable to discharge the powers and duties of his office.” This determination is effective immediately; and once the letter is transmitted (not received), the vice president becomes the acting president. To be sure, Section 4 also permits Congress to pass a law creating an “other body” to replace the principal officers’ role. But proposals to do so have gained little traction, and any such proposal at a time of active Twenty-Fifth Amendment discussion would likely have to be enacted by overriding a presidential veto, making its formation unlikely for now. One such proposal from U.S. Representative Jamie Raskin (D-MD) would create a bipartisan commission composed of medical experts, retired statespersons, and one chair selected by the commission’s membership.
A president may contest that determination by asserting in writing that no inability exists. Once a president contests, the vice president and principal officers have four days to affirm that they stand by their original judgment. If they do not, the president regains his or her powers. If they do, the vice president remains acting president, and the question of inability moves to Congress, which faces a 21-day time limit to decide by affirmative vote. Two-thirds majorities in both houses of Congress (among members present) can sustain the transfer of presidential powers to the vice president less than 30 days after the original determination is sent. If less than two-thirds of either house supports the vice president’s position, the president resumes power immediately.
Section 4 is extraordinarily difficult to invoke, because it requires coordinated action by officials who are typically political allies of the president and appointees in his or her administration. That requirement is designed to screen out frivolous or opportunistic invocations.
Section 4 is also designed to be responsive but reversible: although temporary power can shift quickly to a vice president, that shift only becomes durable with sustained agreement among the vice president, a majority of principal officers, and supermajorities in Congress that the vice president should continue to exercise the president’s powers. It also presumes that the vice president and principal officers can assess a president’s condition. But even if the vice president and a majority of principal officers have decided to invoke Section 4, what exactly does it mean for a president to be “unable to discharge the powers and duties of his office”?
The meaning of “unable to discharge the powers and duties of his office”
The Constitution offers no definition of presidential inability. The standard is intentionally broad, supplying no criteria beyond the text and legislative history. As a matter of common sense, nearly all presidents will at times face illness, injury, or fatigue. Thus, “unable to discharge” cannot logically include situations where a president is operating below peak capacity but is still able to perform core presidential duties, such as issuing rational commands to the armed forces. Conversely, the phrase could encompass situations where a president is still capable of performing some public-facing activities, but behind the scenes, is unable to carry out the core decision-making responsibilities of the office.
Over the last decade, increasing calls for invoking Section 4 can be understood as reflecting three theories of the “unable to discharge the powers and duties of his office” standard. From narrowest to broadest, these theories include diagnosed medical inability; medical inability inferred from erratic action; or inability unlinked to any medical condition. Calls to invoke the Twenty-Fifth Amendment after January 6, 2021 provide useful examples of each. The Guide concludes that the best reading should recognize the second theory: inferred medical inability. Broadly speaking, the constitutional term “unable” may extend beyond a diagnosed debilitating medical condition, to non-medical situations such as when a president is kidnapped, suffers from severe alcohol or substance abuse, or faces a conflict of interest that prevents him from acting in the best interests of the country in a particular situation. It cannot be stretched, however, to cover policy or legal disputes over the proper exercise of “the powers and duties of [the President’s] office.”
(1) The narrowest theory: Limiting to a diagnosed medical inability
On the narrowest view, “unable” is limited to a diagnosed medical or physical incapacity—including a mental condition.
For instance, after members of the House of Representatives called on Vice President Mike Pence and the principal officers to invoke Section 4 against President Donald Trump after the events of January 6, 2021, Pence demurred, claiming that the Amendment “was designed to address presidential incapacity or disability” and implying that the “unable” standard should reflect a certified medical judgment. Under this view, even reckless presidential action would not qualify unless connected with a medically diagnosed disabling condition. Impeachment, not the Twenty-Fifth Amendment, would be the appropriate avenue for removal for presidential recklessness.
(2) A broader theory: Inferring medical inability from presidential actions
But what if available evidence points toward presidential inability, even without a confirmed formal medical diagnosis? Patterns of behavior, surrounding circumstances, and demonstrable failures of judgment may suggest a medical condition—such as dementia—and may constitute evidence of inability even absent a formal medical diagnosis. Could a broader reading of “unable” allow inability to be inferred from a president’s conduct even without a formal medical diagnosis?
Some of those who called for Section 4 to be invoked in connection with the events of January 6, for instance, argued that Trump’s inability was demonstrated by his denial of the election results and his response to the storming of the Capitol. The same approach animated calls to invoke Section 4 with regard to President Joe Biden, particularly surrounding concerns about his age, even in the absence of any medical diagnosis of inability. Similarly, calls to invoke the Twenty-Fifth Amendment have been made by critics of Trump during his second term, based on his allegedly erratic statements. Recent reporting suggests that even his own aides are concerned about his judgment: during the high-stakes April 2026 rescue mission of the downed pilot in Iran, aides reportedly kept the president out of real-time operational discussions, instead relaying updates at intervals because they believed his reactions would not be helpful.
Absent medical diagnosis, Section 4 is unlikely to be successfully invoked on the basis of a single episode suggesting that a president has dementia or a similar disabling mental condition. But we conclude that a documented pattern of highly erratic presidential decision-making and judgment, or repeated episodes of incoherence or other signs of dementia, might be a sufficient basis for a vice president and a majority of principal officers to conclude that Section 4 should be invoked, so long as their decision included adequate consultation with medical experts familiar with the president’s “physical and mental condition.”
(3) The broadest theory: Entirely delinking “unable” from an identifiable medical condition
At the outer edge is the view that “unable” has no meaningful legal content—that it is essentially whatever the relevant actors say it is. Under this view, all that the invokers need to do is claim that a president is “unable to discharge the powers and duties of his office.” Whatever the vice president and eight principal officers decided constituted “inability” would be sufficient to force an involuntary transfer of powers.
In the wake of January 6, some framed invocation as a practical constitutional tool—alternative to the remedy of impeachment—for removing a president. They called for the invocation of Section 4 to remove Trump from office—without explicitly claiming that a medical condition or limitation prevented Trump from discharging his powers and duties, or that his actions were themselves a sign of inability.
But this reasoning misses a key point about the Amendment. It was not written as a simple vote of no confidence: its drafters created a broad standard to encompass a range of emergency situations, not to render the term “unable” an empty term that can be used to collapse the distinction between genuine inability and ordinary political disagreement. The Amendment was not intended to punish a sitting president. It was designed to preserve the continuity of government: to avoid a constitutional gap, not to provide a political weapon. The point was to ensure that someone who is physically and mentally able is always exercising the constitutional powers of the president. When a president becomes objectively unable to discharge his or her constitutional responsibilities, the Amendment provides mechanisms to ensure that the vice president, who has been elected for this purpose, may assume those duties relatively seamlessly, so the nation is not left without a constitutionally capable leader.
Section 4’s limits—and the judgment it demands
What types of situations are most likely to trigger a serious consideration of Section 4? The first and clearest case would be unambiguous medical or physical incapacity: a president who is clearly unable to function due to a medical or physical condition, most obviously unconsciousness. Primary drafter Senator Birch Bayh said that
[a] President who was unconscious for 30 minutes when missiles were flying toward this country might only be disabled temporarily, but it would be of severe consequence when viewed in light of the problems facing the country.
The example illustrates how inability does not have to be permanent to be critical, reflecting the Amendment’s core purpose of providing a mechanism for efficiently responding to time-sensitive crises.
A second case likely to trigger consideration of Section 4 is severe but contested impairment. If a president is conscious but experiences significant physical or cognitive impairment that arguably prevents the discharge of core responsibilities, invocation of Section 4 may become likely, but also more contested.
A third case would be age-related decline: where a president appears to be slowing down, makes fewer public appearances, and does not work the long hours the job normally requires. On these facts alone, Section 4 probably cannot be invoked. Pressure from Congress or the public may lead to the disclosure of medical information about a president’s ability, but without concrete evidence of inability as to core presidential responsibilities, it would be difficult to remove a president based on a mere perception or allegation of age-related decline.
A fourth case would involve corruption. Even extensive evidence that a president is corruptly using the benefits of their office for personal enrichment and rewards to family members or cronies is not alone proof of inability to discharge the core duties of the office. If evidence of corruption is overwhelming, impeachment would likely be the better vehicle for presidential removal than the Twenty-Fifth Amendment. Still, one cannot rule out the possibility of a Twenty-Fifth Amendment Section 4 case where a persistent pattern of consistently lawless presidential behavior led objective medical experts to diagnose a condition suggesting that the president is medically unable to distinguish right from wrong.
Finally, a fifth, difficult case would involve a demonstrated presidential unwillingness responsibly to discharge the powers and duties of the office. At what point may a reasonable constitutional observer infer presidential inability from presidential unwillingness to act? Could Section 4 be invoked, for example, if a president should refuse to respond to an existential, time-sensitive threat; indicates that they are committed to a course of action that would endanger America or the world—an act of war that the vice president and principal officers strongly oppose; or acts in a way that would threaten American constitutional democracy, such as calling to suspend elections? One could argue that a president’s plan to engage in constitutionally subversive activity demonstrates that he or she has become “unable to discharge the powers and duties of the office.” As with any potential invocation of Section 4, the vice president and principal officers would likely deliberate and threaten the invocation of Section 4 privately to attempt to persuade the president to take another course. In an extreme case, a president might exhibit a pattern and practice of openly flouting the law—clearly violating statutes or the Constitution, or disregarding court orders—over the objections of the vice president and the principal officers. In such an extreme case, those constitutional actors could combine evidence of these actions with medical evidence to infer that the president has become “unable to discharge the powers and duties of his office” under Section 4, especially if proposed presidential actions pose significant danger to the country or public. These actions could also constitute impeachable offenses.
These cases show that Section 4 is difficult to invoke and sustain. The constraints are not only substantive but structural: the Amendment concentrates decisive authority in the vice president, meaning that even substantial agreement among other actors in the Section 4 process may not translate into action. And these constraints are not accidental—they reflect the Amendment’s purpose of ensuring continuity without inviting opportunistic removal. They also reflect Section 4’s intended role as a last resort, meant for extraordinary instances when ordinary political pressure or other avenues for accountability are unfeasible.
In sum, Section 4 is not a purely mechanical or strategic tool. As Attorney General Herbert Brownell, Jr., who helped draft the Amendment, emphasized, the Section 4 actors’ “constitutional propriety” and the public’s “constitutional morality” are indispensable to its functioning. Disagreement about Section 4’s boundaries will be inevitable. Reasonable actors will differ about where presidential inability begins and ends. But Section 4 is not a blank check. It is bounded by text, structure, and institutional design as well as political judgments about the costs to the nation of using it.
In recent years, impeachment resolutions have become increasingly commonplace. But if voters elect candidates who are able to perform the duties of the office, the moments where the Twenty-Fifth Amendment becomes applicable should be rare. Should a Section 4 invocation loom, the key watchwords will be transparency, judgment, fidelity to the Constitution. Congress should push for greater information-sharing by holding a vice president accountable through its formal powers. (Vice presidential nominees Gerald Ford and Nelson Rockefeller, for example, both testified before Congress under Section 2 of the Twenty-Fifth Amendment.) Congress could inquire into how the vice president understands his or her constitutional duty under the Amendment, such as what steps he has taken to prepare for these responsibilities, whether a protocol for deliberation is in place, how he understands the scope of “inability,” and his views on specific, publicly reported health issues or behaviors of the president. The public should push for good judgment—demanding transparency both with regard to a president’s medical condition and to the way in which decision-making is currently being conducted within the executive branch. Above all, those officials entrusted with exercising the judgments entailed by that Amendment—the vice president, the principal officers, and Congress—should do so in service of the public and with loyalty to their constitutional roles and to the best interests of the country they serve.
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Authors’ note: The authors are grateful to Professor Joel K. Goldstein for his extensive advice about the Twenty-Fifth Amendment generally, and this article in particular.
