But I feel we are there now. He's actively fomenting violence.
Section 4 addresses the case of an incapacitated president who is unable or unwilling to execute the voluntary declaration contemplated in Section 3; it is the amendment's only section that has never been invoked. It allows the vice president, together with a "majority of either the principal officers of the executive departments or of such other body as Congress may by law provide," to declare the president "unable to discharge the powers and duties of his office" in a written declaration. The transfer of authority to the vice president is immediate, and (as with Section 3) the vice president becomes acting president – not president – while the president remains in office, albeit divested of all authority.
A president thus declared unable to serve may subsequently issue a declaration stating that he or she is able. This marks the beginning of a four-day period during which the vice president remains acting president. If by the end of this period the vice president and a majority of the "principal officers of the executive departments" have not issued a second declaration of the president's incapacity, then the president resumes his powers and duties.
If a second declaration of incapacity is issued within the four-day period, then the vice president remains acting president while Congress considers the matter. If within 21 days the Senate and the House determine, each by a two-thirds vote, that the president is incapacitated, then the vice president continues as acting president; otherwise the president resumes his powers and duties.
https://en.wikipedia.org/wiki/Twenty-fifth_Amendment_to_the_United_States_Constitution
And, apparently, if you keep reading there's a bonus hemorrhoid... err factoid:
On December 22, 1978, President Jimmy Carter considered invoking Section 3 in advance of hemorrhoid surgery.
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