The running opponent from the previous election would take the presidency as with the vice president.
The vice president would become the acting president.
Constitution
Woodrow Wilson had a stroke while president was severely disabled.
25th Amendment.
The 25th.
According to the 25th Amendment of the U.S. Constitution, if the President becomes disabled and is unable to perform the duties of the office, the Vice President assumes the role of Acting President. This transition occurs when the President either voluntarily declares their inability to serve or when the Vice President and a majority of the Cabinet declare the President incapacitated. The President can resume their duties once they inform Congress that they are able to do so.
The 25th amendment to the Constitution did. It was ratified in 1967. It says that if the president is removed the vice president will become the president.
The Vice President and the Senate would need to vote to decide if the president is disabled enough that he can not serve anymore. The president can also resign if he feels he can not serve anymore.
When the current president dies. Also if the current president resigns from office. Also if the president is impeachedAdded: . . . or becomes too ill or incapacitated to carry out his duties,
The vice-president becomes President if the president can not function.
Then the vice president-elect becomes president.
President pro tempore of the Senate becomes President.