Will Section IV of the 25th Amendment be used during Trump's Presidency?

Section 4 is not just a question of presidential weakness or public controversy; it requires the vice president and a majority of the principal cabinet officers to formally conclude that the president cannot discharge the powers and duties of office. That makes it an extraordinarily rare, high-friction mechanism, and history suggests it is used only when there is a clear incapacity event that is obvious, immediate, and broadly recognized inside the administration. In an ordinary political crisis, even a severe one, officials usually prefer denial, resignation pressure, impeachment talk, or informal delegation over triggering a constitutional showdown that could fracture the executive branch.

There is some non-trivial tail risk because Trump is older, the term is long, and an acute medical or cognitive crisis could arise unexpectedly. A sudden hospitalization, major neurological event, or visible inability to function could create the sort of emergency in which the vice president and cabinet have to consider Section 4 seriously. But the probability remains low because the process requires a coordinated revolt from close allies, and any participants would know it could end their political careers if the evidence is ambiguous or the president survives the event and returns.

Against the current market price of 30%, this looks materially overpriced. The market appears to be assigning too much weight to rhetoric, social-media calls for the 25th Amendment, and the general sense that Trump is controversial or volatile, when the event requires a formal constitutional action by his own top officials. I think the more realistic probability is in the high single digits, with the market likely overstating both the chance of a qualifying health crisis and the chance that a loyal vice president and cabinet would actually move on it.