Former Navy SEAL Tim Sheehy has beaten three-term Democrat Senator Jon Tester in the Montana Senate race, flipping a key race as Republicans are set to take back control of the Senate, the Associated Press projects.

Republican Tim Sheehy will defeat three-term Montana Sen. Jon Tester, CNN projects, boosting the GOP’s hopes of claiming the Senate majority.

Republican Tim Sheehy triumphed over third-term Sen. Jon Tester (D-MT) in Montana’s crucial Senate race, expanding the GOP majority in the Senate. Sheehy led Tester 53% to 45% when the race was called by the Associated Press at 6:26 a.m. EST on Wednesday.