The President assumes his duties upon being sworn into office. This used to occur on March 4, but in 1934, it was moved to January 20, and it is on that day when the new president officially takes office.
The vice president then becomes the president.The vice president would assume those duties.
January 20th
It is Speaker of the house I believe.
Kennedy was the youngest elected US president.
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In this case the vice president would assume the duties of the president temporarily.
The Cabinet members in the order of which their departments were created.
The 25th amendment to the Constitution allows for a procedure to allow the Vice President to assume the duties of "Acting President".
The vice president becomes President if the President dies or is removed from office . There are also procedures by which the vice-president can temporarily assume the duties of president, either voluntarily or involuntarily.
The vice president's most important role is to be ready at all times to assume the presidency if the president, for various reasons, can no longer perform those duties.
What are three ceremonial duties of the President?
If the President and Vice-President are not able to fulfill their duties, the Speaker of the House (currently R-OH John Boehner) would assume the presidency. After that the President Pro Tempore of the Senate (currently D-HI Daniel Inouye) would assume the presidency. The 5th in line to the presidency is the Secretary of State (currently D-NY Hillary Clinton).