The Republican Party currently holds the majority in both the House and the Senate, with Mike Johnson serving as Speaker of the House and John Thune as Senate Majority Leader as of August 2025[1][2][3][4].

Congressional Majorities

Key Leadership

Notable Members

Recent Voting and Legislative Dynamics

Summary Table

Chamber Majority Party Key Leader(s) Voting Margin
House Republican Mike Johnson (Speaker) 219–212 (4 vacant) [1][2][3]
Senate Republican John Thune (Maj. Leader), Barrasso (Whip) 53–47 [1][2][4]

Congress is currently operating with very close margins, which amplifies the importance of party unity, swing votes, and committee leadership in both chambers [1][2][3][4].