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 bashed 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 (D-Mont.) during a campaign rally in his home state of Montana on Thursday night, accusing the incumbent senator of embracing the "swamp" in Washington, D.C.

“Jon Tester will never drain the swamp because he happens to live in the swamp and he loves the swamp,” Trump said in Billings, Mont., while touting Tester's Senate GOP rival Matt Rosendale.

"The problem is he’s never going to vote for me,” Trump added, referring to Tester.

Trump attempted to tie the Democratic senator to his popular foils, Senate Democratic Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (N.Y.), House Democratic Leader Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (Calif.) and Rep. Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.).

“Don’t forget, Tester’s going to vote with the Waters and the Pelosi's. Can you believe it, Maxine Waters is the new leader in the party…she is something. But he’s going to vote for Schumer, he’s going to do whatever they say…Their policies are horrible,” he said.

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“Jon Tester talks like he’s from Montana, but he votes like he’s Nancy Pelosi," Trump added.

Trump also slammed Tester for his handling of the failed confirmation of Dr. Ronny Jackson as secretary of the Department of Veterans Affairs (VA).

Tester, as ranking member of the Senate Veterans Affairs Committee, announced allegations of misconduct made against Jackson by coworkers.

Sen. Johnny Isakson Johnny IsaksonLoeffler paints herself as 'more conservative than Attila the Hun' in new campaign ad Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement Loeffler: Trump 'has every right' to fill Ginsburg vacancy before election MORE (R-Ga.) supported Tester in his handling of the allegations.

Tester's campaign issued a statement that steered clear of criticizing Trump while highlighting the president's praise for bills advocated by Tester.

“Thank you to President Trump for once again praising the work Jon Tester has done reducing regulations, fighting for veterans, and working to hold the VA accountable," Tester campaign manager Christie Roberts said in a statement.

"We urge the President to sign Jon’s 19th bill that currently sits on his desk. While Jon keeps fighting for Montana, Matt Rosendale continues to look out for himself rather than stand up for Montana."

During his rally Thursday night, Trump praised Tester’s opponent Rosendale, the Montana state auditor and former member of the state legislature.

“Very, very important that we elect Matt, and frankly other republicans,” Trump said.

Rosendale briefly came to the podium to heap praise upon Trump, saying, “This crowd is all here for you, and what a crowd it is."

"Thank you for fighting for us and for always putting America first. Montana is going to right a wrong this November and we’re going to send you the conservative reinforcements you need to continue your good work,” he said.

"My promise to each and every one of you is that I will always put Montana first and stick with president trump to make sure we advance his agenda."

Rosendale went on to tout Trump’s immigration policies, vow to only serve two terms in the Senate and announced the National Rifle Association's endorsement of his campaign.

Tester is one of 10 Democratic senators running for reelection in states Trump won in 2016. Two polls show him with a single-digit lead over Rosendale, and the nonpartisan Cook Political Report rates the race as as "likely" Democrat.