"Trump-Backed Tim Sheehy Challenges Rep. Matt Rosendale in Contentious Montana Senate Race"

GOP Rep. Matt Rosendale has announced his Senate bid in Montana, setting up a contentious primary against former Navy SEAL Tim Sheehy, who has the backing of the National Republican Senatorial Committee and Senate Minority Leader Mitch McConnell. Former President Donald Trump has endorsed Sheehy, dealing a blow to Rosendale's campaign. The race is seen as critical for Republicans' efforts to flip the Senate, with concerns about the party's ability to win the seat in November. Incumbent Democratic Sen. Jon Tester is considered vulnerable, and both Rosendale and Sheehy have endorsed Trump's presidential run.