1 January
Today congress is being sworn into office.
Yes-congressmen take an oath of office before they begin work.
it is congressmen.
For what office? Congressmen, Senators and Presidents all have different terms of office
Congressmen and Senators in the US have no term limits.
No. President was the only elected office he ever held.
Congress does not have time limits. Individual congressmen have time limits in the sense that their term of office runs out, but Congress itself can take as much time as it likes.
No. Neither do US Senators and Congressmen.
It is not unusual-- maybe one or so a year. Most of them resign before the trials are held, so they are not really Congressmen when they go to jail. The related link gives a list. I do not think it is complete.
Each runs for office, people vote for them, and they are elected. They get the seat because people feel they will be represented in congress.
Members of Congress have a public swearing-in ceremony at the start of each new Congress. The current oath (2014) was written in the 1860s.
The possessive form for the noun congressmen is congressmen's.Example:The congressmen's luncheon is scheduled for one o'clock.The congressmen's offices are on the second floor.