Republican Dave McCormick won the U.S. Senate election in Pennsylvania, Decision Desk HQ projected on Thursday, beating Democratic incumbent Bob Casey in an important win for Republicans hoping to capture a majority in the chamber.

Unofficial returns in the race between Senator Bob Casey and Dave McCormick have triggered a mandatory recount under state law.

The tight margin in the Senate race between Sen. Bob Casey, D-Pennsylvania and Republican Sen.-elect Dave McCormick has triggered an automatic recount under Pennsylvania law.

The first test will come Wednesday during internal House Republican leadership elections that will establish the new power centers for a Washington dominated by President-elect Donald Trump.

In January, Mike Johnson faces another vote to stay in the job that places him second in line for the presidency after Vice President-elect JD Vance.

Speaker Mike Johnson has won the support of enough Republicans to stand as their candidate for the gavel in January.