Tim Sheehy Wins G.O.P. Nod to Challenge Tester for Senate in Montana

Tim Sheehy, a businessman and former Navy SEAL, won the Republican primary for U.S. Senate in Montana on Tuesday, according to The Associated Press, setting him up for a November showdown against Senator Jon Tester, the Democratic incumbent.

With 27 percent of the vote counted, Mr. Sheehy had 75.5 percent, well ahead of his lesser-known opponents. Brad Johnson, Montana’s former secretary of state, had 18 percent of the vote, and Charles Walkingchild had 6.5 percent.

The Republican primary was essentially a foregone conclusion since February, when Representative Matt Rosendale abruptly exited the race — less than a week after he entered it — citing former President Donald J. Trump’s endorsement of Mr. Sheehy. Mr. Rosendale, a right-wing hard-liner, had been viewed as the only serious challenger to Mr. Sheehy, for whom the Republican establishment had worked to clear the field. His victory is a boon for Republicans as they work to recapture control of the Senate, competing on a favorable map in which a number of vulnerable Democrats face tough re-election battles.

“Tim Sheehy is a strong conservative, an American hero and a successful businessman who will bring an outsider’s perspective to a broken Washington,” said Senator Steve Daines, the Montana Republican who leads the National Republican Senatorial Committee, which works to elect Republicans to the Senate. “The clearest path to a Republican Senate majority runs through Montana.”

Mr. Sheehy will face a formidable opponent in Mr. Tester, a popular incumbent who has survived past challenges in his ruby-red state by leaning on his background as a third-generation Montana farmer and his reputation of bipartisanship. Recent polls have suggested a tight race, and the nonpartisan Cook Political Report rates Montana a “tossup.” Mr. Tester officially captured the Democratic nomination on Tuesday.

Mr. Tester has a cash advantage; he raised $4.1 million between April 1 and May 15, according to recent financial filings, and his campaign has $11.7 million cash on hand. Mr. Sheehy’s campaign raised $2.1 million in the same period — including $600,000 the candidate lent himself — and had $2.2 million cash on hand.