Section 1.
"In case of the removal of the President from office or of his death or resignation, the Vice President shall become President."
Section 2.
"Whenever there is a vacancy in the office of the Vice President, the President shall nominate a Vice President who shall take office upon confirmation by a majority vote of both Houses of Congress."
Section 3.
"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."
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.
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."
Section 1.
The Vice President will become President if the current President is not able to serve, dies, resigns, or is removed from office.
Section 2.
If the Vice President is not able to serve, the President may choose a new Vice President who must be voted for and approved by Congress.
Section 3.
The President is allowed to make the Vice President the Acting President with a written declaration, one when the period begins and one when it ends.
Section 4.
If necessary, the Vice President and members of the cabinet can declare the President unfit to carry out the duties of Presidency. The President may then assert his ability to serve to Congress, and in return the Vice President and Congress are able to submit another declaration against the President. If this is the case, Congress would have to reach a 2/3 majority vote that the President is unfit for office.
(This section has never been used).
This amendment has only been invoked a few times since its passage in 1967. The most famous usage of the 25th amendment was when Nixon resigned from office. In the aftermath of an Arab oil embargo, gas rationing, and the Watergate scandal, he resigned since impeachment was very likely.
I was curious on what occasions this amendment has been invoked, and this article gave me all the answers. There is definitely a trend of Presidents during a surgery, illness, or emergency, turning over temporary Presidential powers to the Vice President but insisting that they did not want to invoke the 25th amendment. That's not how it works!!!