Charles Ellis Schumer is an American politician serving as the Senate minority leader since 2017. A member of the Democratic Party, Schumer is the senior United States senator from New York, a seat to which he was first elected in 1998. He is the current dean of New York's congressional delegation.
From Wikipedia
“A Democratic majority in the U.S. Senate would be the biggest difference maker to help President-elect Biden deliver for working families across the country”