Well here’s the thing. We need to bear in mind that it this point, only people like us–politically engaged, center left, types–are really exorcised about this. The MSM will be off chasing shiny inauguration and confirmation and agency blowing up objects in a few days, the majority of Republicans seem to believe it was fine and dandy for a hostile foreign power to conduct covert ops to subvert democracy as long as they (stupidly think they) benefit, and a bunch of people on the left are still in deep denial at the very idea that they were Jar-Jarred by Vladimir Putin.
But when it happens, it may well look like this:
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.
Thereafter, when the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that no inability exists, he shall resume the powers and duties of his office unless the Vice President and a majority of either the principal officers of the executive department or of such other body as Congress may by law provide, transmit within four days 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. Thereupon Congress shall decide the issue, assembling within forty-eight hours for that purpose if not in session. If the Congress, within twenty-one days after receipt of the latter written declaration, or, if Congress is not in session, within twenty-one days after Congress is required to assemble, determines by two-thirds vote of both Houses that the President is unable to discharge the powers and duties of his office, the Vice President shall continue to discharge the same as Acting President; otherwise, the President shall resume the powers and duties of his office.
U.S. Const., Amend. 25, Sec. 4.