WASHINGTON (AP) — The general election for a race that could determine the Senate majority begins right after Montana voters lock in their nominees in Tuesday’s primaries.

The center of the political storm in Montana is the U.S. Senate race, in which Democrat Jon Tester is running for reelection. Republican leaders including Sen. Steve Daines, chairman of the National Republican Senatorial committee, are supporting Tim Sheehy for the GOP nomination. Sheehy, a retired Navy SEAL who has the personal wealth to help pay for an expensive challenge to Tester, faces two other candidates on the ballot.

Rep. Matt Rosendale’s attempt to join the race was quickly rebuffed when former President Donald Trump endorsed Sheehy the day that Rosendale announced he was running for Senate, too. Rosendale dropped out of the race less than a week later, announcing his intent to run for reelection instead. At that point, however, Republicans had already lined up to run for his open House seat. Now, Rosendale isn’t running for office in 2024 at all.