On January 20, 2021, Democrats gained a Senate majority with the swearing-in of newly elected Georgia senators Jon Ossoff and Raphael Warnock, following the 2020–21 election runoff and special election runoff, making Schumer the majority leader, replacing Republican Mitch McConnell.

How often is the Senate majority leader chosen?

The floor leaders and whips of each party are elected by a majority vote of all the senators of their party assembled in a conference or, as it sometimes is called, a caucus. The practice has been to choose the leader for a two-year term at the beginning of each Congress.

Who is the longest serving Senate majority leader?

Serving sixteen years, from 1961 until his retirement in 1977, Mansfield is the longest-serving Majority Leader in the history of the Senate.