President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s former national security adviser Michael Flynn will campaign in Montana for Republican Senate candidate Troy Downing.

Downing, one of four Republican candidates vying to take on Democratic Sen. Jon Tester Jonathan (Jon) TesterPence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Filibuster fight looms if Democrats retake Senate MORE in the midterm elections, announced the news on Twitter on Friday.

The candidate has aligned himself with Trump by backing the building of a border wall and the Republican tax law.

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Flynn was fired as Trump’s national security adviser in early 2017 after it became public that he had misled administration officials about his contact with a Russian government official.

He pleaded guilty to lying to the FBI about his communication with Sergey Kislyak, the former Russian ambassador to the U.S.

Flynn is also reportedly cooperating with special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE in his investigation into Russian meddling in the 2016 election.

Downing's campaign manager told CNN that Flynn “is an American Patriot and combat veteran who has served our country for 33 years. He is coming to Montana to support Troy Downing, a fellow combat veteran, because he is the best candidate to defeat career politician Jon Tester.”