I should have been more specific...something like hospitalized but breathing on his own for example
From today’s NY Times -
The presidential line of succession, laid out in a 1947 law, falls first to Mr. Pence. If he were to become too ill to carry out the duties of the president, the House speaker, Nancy Pelosi, would step in. Ms. Pelosi has been tested and is waiting for her results. After Ms. Pelosi, Senator Chuck Grassley, currently the Senate President Pro Tem, would step in. Next in line is the Secretary of State, Mike Pompeo. Mr. Pompeo said Friday that he tested negative and feels fine. Should Mr. Pompeo fall ill, the Treasury Secretary Steven Mnuchin, would step in. Mr. Mnuchin’s spokeswoman tweeted on Friday that he too tested negative. (An earlier version of this article omitted the Senate President Pro Tem.)
Left unclear is how it is decided that a president is too ill to perform his duties.
The 25th Amendment was intended to deal with any ambiguity about who leads the government when a president cannot. If the president becomes sick and the cabinet determines that he or she is unable to perform the office’s duties, the amendment grants the administration the power to temporarily transfer authority to the vice president. Once the president deems himself fit, he can reclaim the power of the presidency.
Other U.S. presidents have fallen seriously ill while in office — George Washington was feared close to death during a flu outbreak and Woodrow Wilson was gravely ill during peace talks after World War I in Paris — and four have died of natural causes while in office. Four others were assassinated.