U.S. Department of Veterans Affairs

GOP lifts up Montana Senate candidate trying to oust Tester

He might not have been their first choice, but Republicans are all in on Montana's Matt Rosendale as they look to defeat Democratic U.S. Sen. Jon Tester, the incumbent who has drawn President Donald Trump's ire.

State party leaders, national Republicans and conservative donors began rallying around the state auditor and insurance commissioner Wednesday, a day after he won a heated GOP Senate primary. Rosendale said he received a congratulatory call from Donald Trump Jr. and that he hopes the president will campaign with him in Montana during the general election.

Rosendale, 57, will be relying on that party unity, continued help from deep-pocketed GOP donors and the...