Whenever the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that he is unable to discharge the powers and duties of his office, and until he transmits to them a written declaration to the contrary, such powers and duties shall be discharged by the Vice President as Acting President.
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Preamble · Seven Articles
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Amendment XXV · Section 3
1 selectable clause · PDF page 18
Notes supplied with the source text
Passed by Congress July 6, 1965. Ratified February 10, 1967. (Note: Article II, Section 1 of the Constitution was modified by the 25th Amendment.)
Source: the uploaded National Constitution Center edition. Historical wording and its bracket markers remain visible; later amendments and the reading notes explain changes.