Montana State Auditor Matt Rosendale (R), who narrowly lost a Senate race last year, announced on Monday he will run for the state's at-large House seat in 2020.

Rosendale is seeking the seat being vacated by Rep. Greg Gianforte Gregory Richard GianfortePence seeks to boost Daines in critical Montana Senate race On The Trail: How Nancy Pelosi could improbably become president Supreme Court denies push to add Green Party candidates to Montana ballot MORE (R-Mont.), who recently announced his bid for governor.

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Rosendale narrowly lost against 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 (D-Mont.) during the 2018 election cycle.

“I’m running for the U.S. House to serve and work for the people of Montana. I pledge to always listen, represent our values, and protect our Montana way of life. With all the gridlock and fighting back in the swamp, it’s clear Washington D.C. could learn a thing or two from Montana,” he said in a statement.

“I’ve rolled up my sleeves to get to work to deliver affordable and better health care to Montanans, took on the pharmaceutical industry to lower drugs costs, protected and expanded access to our public lands, and brought fiscal discipline to my office – and I’ll do the same as your next Congressman.”

In a campaign video released Monday, Rosendale also touted his work on the state’s health care policy. Democrats used health care as a key campaign issue and were able to take over the House last year.

“While Washington fights, Matt Rosendale goes to work. He expanded access to health care, lowered premiums, protected preexisting conditions, lowered drug costs — that was Matt’s bill,” the ad says.

The Montana Republican has been a vocal supporter of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, who endorsed and campaigned for him during the midterms.

Rosendale has already garnered the support of conservative political action group Club for Growth, which tweeted its endorsement of the candidate shortly after his announcement.

“@club4growth PAC is proud to endorse Matt Rosendale for Congress!," the group said in a tweet. "@MattForMontana is precisely the type of leader needed in Washington. He has the guts to take on the establishment & and will fight to advance @realDonaldTrump’s pro-growth economic agenda."