Senate Majority Leader

The Senate Majority Leader is a Senator affiliated with the majoritarian party (the one holding 50 seats and the vice-presidency or 51 seats and above) which was elected his party leader, that is, the main spokesperson for the party in the U.S. Senate. The position is equivalent to the Speaker of the House of Representatives in the House. Senate Majority Leaders are always members of the body and are elected on Week 1.

Powers
The Senate Majority Leader is the only position that allows the holder to reject or advance all bills proposed by the Senate, as well as bills seeking approval from the House of Representatives. With the seniority(and political points) yielded by the position, many Senators use it to jump into the Presidency.

Election
On Week 1, senators(most of them caucus chairs or have high seniority in their caucus) run in an election to determine who will represent the party as the candidate for Senate Majority Leader. After that, the Senate will vote between the Democratic and Republican nominee, which is decided along party lines.