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.
It is ultimately up to Congress whether or not the President of the United States is fit to serve if he/she becomes disabled during term of office. Medical personnel are also in on this decision.
This is spelled out in the 22nd amendment of the constitution. The president himself can decide he is disabled and that is the simple case. If his cabinet thinks he is disabled but he thinks not, there is a procedure that can be followed.
The vice-president plus a majority of the Cabinet can decide that the president is unable to serve unless the president disagrees. If the president disputes his inability to serve, Congress resolves the dispute and a 2/3 majority is needed in order to rule against the President.
A disabled US president can temporally or permanently have his powers given to the Vice- President. The 25th amendment gives procedures whereby the President can voluntarily give up his power and how he can be stripped of his powers involuntarily. It also gives a process whereby the President can regain his powers.
See the link for the text of the Amendment 25.
Amendment 20 of the constitution deals with this possibility. If the presidents states in writing that he can not perform his duties, the vice-president performs them. If the president can not or will not state that he is disabled, but in the opinion of the vice-president and a majority of his cabinet, he is unable to perform his duties, the vice-president can be authorized to perform them. The amendment also provides for restoring the president's powers if he recovers from his disability.
The Constitution decides who will be president.
The presidential succession act determines who takes office if the president becomes disabled.
the vice president
Woodrow Wilson had a stroke while president was severely disabled.
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,
If Obama dies in office, his vice President, Joe Biden, becomes the next President.
The Vice President
If the president is mentally disabled and refuses to leave office or do his job, he can be impeached and kicked out. Only a few presidents have been impeached. Andrew Johnson, the man who served after Lincoln was shot, was impeached. One of the articles of impeachment was that he spoke too loud in the senate.
If he dies in office, then Dick Cheney becomes President.
The vice president becomes the president if the president dies. Such is the main reason for the office of vice president.
If the president dies then the vice president takes office if the vice president dies then the speaker of office is president
The Speaker of the house becomes president
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Legislative Branch
The Vice-President.