Former President Donald Trump headed to Montana for a Friday night rally in hopes of ousting the state's Democratic senator, but his plane first had to divert to an airport on the other side of the Rocky Mountains because of a mechanical issue, according to airport staff.

Trump's plane was en route to Bozeman, Montana, when it was diverted Friday afternoon to Billings, 142 miles to the east, according to Jenny Mockel, administrative assistant at Billings Logan International Airport. Mockel said the former president was continuing to Bozeman via private jet.

Trump's campaign posted a video of him upon landing in which he said he was glad to be in Montana but did not mention anything about the landing.

The former president came to Montana hoping to remedy some unfinished business from 2018, when he campaigned repeatedly in Big Sky Country in a failed bid to oust incumbent Democratic Senator Jon Tester.

Tester has tried to convince voters he's aligned with Trump on many issues, mirroring his successful strategy from six years ago. While that worked in a nonpresidential election year, it faces a more critical test this fall with Tester's opponent, former Navy SEAL Tim Sheehy, trying to link the three-term incumbent to Democratic presidential candidate Kamala Harris.

Harris has benefited nationally from a burst of enthusiasm among core Democratic constituencies, who coalesced quickly around her after President Joe Biden withdrew from the campaign last month. She's drawn big crowds in swing states, touring this week with Minnesota Governor Tim Walz, her choice to be her vice presidential nominee.

Trump's only rally this week, meanwhile, will be in a state he won by 16 percentage points four years ago rather than a November battleground. Facing new pressure in the race from a candidate with surging enthusiasm, Trump on Thursday called questions about his lack of swing state stops "stupid."

"I don't have to go there because I'm leading those states," he said. "I'm going because I want to help senators and congressmen get elected."

He will add fundraising stops in Wyoming and Colorado.

Trump could be decisive in Montana's Senate race.

Friday's rally at Montana State University, which is scheduled to start at 8 p.m. Mountain time, is expected to draw thousands of GOP supporters. Yet the former president's bigger impact could be simply having his name above Sheehy's on the ballot in November, said University of Montana political analyst Rob Saldin.

"There is a segment of the electorate that will turn out when Trump is on the ticket," Saldin said. And that could benefit Sheehy, a Trump supporter and newcomer to politics who made a fortune off an aerial firefighting business.

Republicans have been on a roll in Montana for more than a decade and now hold every statewide office except for Tester's.

Tester won each of his previous Senate contests by a narrow margin, casting himself as a plainspoken farmer who builds personal connections with people in Montana and is willing to break with his party on issues that matter to them. He's also become a prolific fundraiser.

The race has drawn national attention with Democrats clinging to a razor-thin majority in the Senate and defending far more seats than the GOP this year. Tester is considered among the most vulnerable Democratic incumbents.

For him to win, large numbers of Trump supporters would have to vote a split ticket and get behind the Democratic senator.

Trump's drive to oust Tester traces back to the lawmaker's work in 2018 as chairman of the Senate Committee on Veterans' Affairs. Tester revealed past misconduct by Trump's personal physician, Ronny Jackson, that sank Jackson's nomination to lead the Veterans Affairs Department.

Then-President Trump took the matter personally and came to Montana four times to campaign for Republican Matt Rosendale, who was then the state auditor. Rosendale lost by 3 percentage points. (AP, excluding headline)

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