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Chester Trent Lott Sr. (born October 9, 1941) is an American lawyer, author, and politician. A former United States Senator from Mississippi, Lott served in numerous leadership positions in both the United States House of Representatives and the Senate. He entered Congress as one of the first of a wave of Republicans winning seats in Southern states that had been solidly Democratic. Later in his career, he became Senate Majority Leader, and, alternately, Senate Minority Leader. He also joined with three other Republican Senators in the Singing Senators barbershop-like quartet. In 2003, he stepped down from the position after controversy due to his praising of senator Strom Thurmond's 1948 segregationist Dixiecrat presidential bid.

From 1968 to 1972, Lott was an administrative assistant to Representative William M. Colmer of Mississippi, who was also the chairman of the House Rules Committee. Upon Colmer's retirement, Lott won Colmer's former seat in the House of Representatives. In 1988, Lott ran successfully for the U.S. Senate to replace another retiree, John C. Stennis. After Republicans took the majority in the Senate, Lott became Senate Majority Whip in 1995 and then Senate Majority Leader in 1996, upon the resignation of presidential nominee Bob Dole of Kansas.

On December 20, 2002, after significant controversy following comments regarding Strom Thurmond's presidential candidacy, Lott resigned as Senate Minority Leader. He resigned from the Senate in 2007 and fellow Republican Roger Wicker won the 2008 special election to replace him. Lott became a lobbyist, co-founding the Breaux–Lott Leadership Group. The firm was later acquired by law and lobbying firm Patton Boggs. Lott serves as a Senior Fellow at the Bipartisan Policy Center (BPC), where he focuses on issues related to energy, national security, transportation and congressional reforms. Lott is also a co-chair of BPC's Energy Project. In June 2020 Lott was fired from the Washington law and lobbying firm Squire Patton Boggs while negotiating to join another firm. On June 15, 2020 Lott joined Crossroads Strategies along with his longtime colleague John Breaux.