The 25th Amendment to the Constitution
Section 4.
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.
Let us pray that J.D. Vance is up to the task. My only reservation is that he would make a less than ideal replacement for his predecessor.
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