Bernard Sanders is an American politician and activist who is the senior United States senator from Vermont. Sanders is the longest-serving independent in U.S. congressional history but has a close relationship with the Democratic Party, having caucused with House and Senate Democrats for most of his congressional career and sought the party's presidential nomination in 2016 and 2020, coming second in both campaigns. He is often seen as a leader of the U.S. progressive movement.

The United States Senate is the upper chamber of the United States Congress. The United States Senate and the lower chamber of Congress, the United States House of Representatives, comprise the federal bicameral legislature of the United States. Together, the Senate and the House maintain authority under Article One of the U.S. Constitution to pass or defeat federal legislation. The Senate has exclusive power to confirm U.S. presidential appointments, approve or reject treaties, and try cases of impeachment brought by the House. The Senate and the House provide a check and balance on the powers of the executive and judicial branches of government.