Understanding the Twenty-Fifth Amendment: not a quick route to oust a president
The Twenty-Fifth Amendment provides a process for replacing a president who is unable to discharge the duties of office: the vice president and a majority of the executive department heads can declare the president incapacitated, making the vice president the acting president; the president can contest this, and Congress then has 21 days to decide by a two-thirds vote to remove him. In practice, invoking it against a sitting president (as discussed with Trump) is uncertain, requires broad cabinet support (eight of 15 principal officers), and would be temporary; impeachment remains the constitutional route to remove a president.