Who is the leader of the senate and also works with the president? what is the senate pro tempore? —not the actual name of the person.

The leader of the Senate is the president of the senate. This is the Vice President of the U.S. President pro tempore of the Senate is basically a senator who acts in place of the President of the United States Senate that is the Vice President of the United States.

four sitting presidents have been assassinated while in office but the first was abraham lincoln,