they must swear to always support the constitution no matter what, but they will have no religious requirments.
stuff
smd
The constitution.
stuff
All federal officers are required to state an oath before taking office. This includes all members of all three branches of the government. The oath of office is in the Constitution.
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.
me
Ronald Reagan.
None of the individuals who were elected as President died before taking office. William Henry Harrison was sworn in and died 31 days later.
Upon taking office Andrew Jackson replaced federal officials with his political supporters, it became known as the spoils system.
the vice president takes his place
teddy roosevelt