Tim Sheehy, a wealthy Republican businessman, was dogged by controversies during the campaign. But Senator Jon Tester, a Democrat, could not outrun the demographic shift in his deep-red state.

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 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%-45% when the race was called by the Associated Press at 6:26 a.m. EST on Wednesday.