Sen. Chuck Schumer (D-N.Y.) is officially Senate majority leader after the inauguration of Vice President Kamala Harris and the swearing-in of new Sens. Alex Padilla (D-Calif.), Jon Ossoff (D-Ga.) and Raphael Warnock (D-Ga.).

Why it matters: With a 50-50 Senate, Schumer will control a narrow majority with Harris as the tie-breaking vote. Democratic control of the Senate is crucial to President Biden’s agenda, from getting his coronavirus relief proposal passed to forgiving student debt.

The big picture: After more than 20 years in the Senate, Schumer will be taking the position from Sen. Mitch McConnell (R-Ky.), who became majority leader in 2015.