“Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President.”
Vice-President Pence and a majority of cabinet members certify to both houses of Congress that Trump is unable to perform as President.
Pence then assumes the powers and duties of the office and serves as Acting President.
If Trump objects (and he will), a two-thirds vote of both houses of Congress is required to prevent Trump from regaining office.
Congress has identified three general types of conduct that constitute grounds for impeachment, although these categories should not be understood as exhaustive:
* (Note: Although Trump was impeached and tried for trying to extort the Ukranian government, there’s no shortage of “high crimes and misdemeanors” for which he may be impeached anew.)