Republicans will kick off the 119th Congress with a five-seat majority in the U.S. House of Representatives – the smallest margin of control in modern history. Their grip could become even more tenuous as three Republican seats are expected to be vacant in early 2025 until special elections are held.

Republicans’ majority in the Senate is set to be lean as well. They’ll hold 53 of 100 seats, with a potential tiebreaking vote from incoming Vice President JD Vance.