Yes-congressmen take an oath of office before they begin work.
First he has to be legally elected as President or else become president by succession. Second he must be "sworn in" by taking the oath of office before a person who is legally qualified to administer oaths.
Both the Oath of Office and the requirement that the President take care that the laws be faithfully executed are specified in the US Constitution.
Because he refused to take an oath to the Confederacy.
To take the first oath of office in New York City.
James MonroeThe first president to take the oath was George Washington.
James Monroe
Yes, he did.
James Monroe
James Monroe-1817
James Madison
No, he used the Bible to take his oath of office.
Oath of Office
Yes-congressmen take an oath of office before they begin work.
James Earl Carter. The first president to take the Oath of Office with his nickname under the name Jimmy Carter.
James monroe by Samantha Davis
Joe Biden would serve as the President and therefore take the oath of office in the case the Obama did not.