NBC News projects Tim Sheehy has won the seat held by Jon Tester, a three-term Democratic incumbent, in a state that has shifted in Republicans’ direction in recent years.

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.

Sen. Jon Tester is fighting to hold onto his seat against Republican challenger Tim Sheehy in a race that could determine control of the Senate.