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.
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.
The President is still the President if he or she is out of the country - it's only when he or she is INCAPACITATED that the Vice-President becomes (acting) President.