MISSOULA, Mont. — President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE is planning a fourth trip to Montana, a state he won by 20 points, in an effort to knock off Democratic incumbent Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (Mont.), according to Republican sources in the state.

Tester appeared to be cruising to an easy reelection victory earlier this year, but the race has tightened in recent weeks, something Republicans say is largely due to the polarizing effect of the bitter fight over Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughSenate GOP set to vote on Trump's Supreme Court pick before election Conservative groups unleash ad blitz in support of Barrett's nomination Two Judiciary Democrats say they will not meet with Trump's Supreme Court pick MORE.

Sensing vulnerability, Trump is going to make another visit to Montana next weekend to help Tester’s challenger, state auditor Matt Rosendale.

The visit would come just more than two weeks after Trump held a rally for Rosendale in Missoula on Oct. 18.

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The next rally is expected to take place in Bozeman, Montana’s tech hub, which Hillary Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE carried narrowly in 2016. She won Gallatin County by a point with 45.6 percent of the vote.

“Looks like he’s coming a fourth time now, looks like next Saturday. Probably somewhere in Bozeman,” said Sen. Steve Daines Steven (Steve) David DainesOn The Trail: Making sense of this week's polling tsunami The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Credit union group to spend million on Senate, House races MORE (R-Mont.), who campaigned with Rosendale and Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, the president’s eldest son, Saturday morning.

“Donald Trump is popular in Montana, I think that’s reflected in the attendance we’re seeing,” Daines said at a rally at the Flathead County Fairgrounds in Kalispell, which was attended by roughly 200 to 300 people.

Daines said he thinks the high-profile fight over Kavanaugh has revved up GOP voters in the state.

“Montana Senate races usually have been close races,” he said. “The Kavanaugh confirmation process moved numbers around the country. I don’t think Montana is an exception to that.”

The star of Saturday morning’s event was Trump Jr., an avid hunter and fisherman, who has been coming to Montana for years.

An event Trump Jr. headlined in Butte Friday drew an estimated 200 to 250 people. He also attracted a boisterous crowd just outside Helena Friday evening.

Trump Jr. later confirmed at another event in Missoula that his father will be back in the state next weekend.

“I believe he is,” he said.

State Rep. Mike Cuffe (R), a state house representative running for the state senate, said the Tester-Rosendale race will come down to turnout, something that Trump can help generate.

“It is very important that the voters show up and vote. That is very key. There is a contingent of folks that sometimes lay back, thinking they don’t need my vote. This time they do,” he said.

A recent Montana Television Network-Montana State University poll conducted in late September and early October showed Tester with a 3-point lead.