Senators and Representatives work for the U.S. Congress and the people who elect them.
An executive order
The representatives are elected from one district that covers the whole state
People say that the Vice President is "only a heartbeat away" from the presidency because the vice president is first in the order of succession. If the President's heart should stop beating, the Vice President takes over the office.
If the president dies or otherwise become incapacitated, the vice-president becomes president.
constitution
The British Parliament
It goes to Committee.