The conservative Club for Growth will run advertisements in Utah markets blasting Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah) as a “Democrat secret asset” who supports impeaching President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

The 30-second spot will begin running on digital channels and on Beehive State Fox News stations Thursday and accuses the senator of “plotting to take down President Trump with impeachment.”

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“Slick, slippery, stealthy: Mitt Romney had us fooled. Posing as Republican, he tried to infiltrate Trump’s administration as secretary of State,” the ad says, in reference to reports Romney was under consideration for the Cabinet post in late 2016.

“Tell Romney, quit colluding with Democrats on impeachment,” it adds, displaying Romney’s office number.

“There are two things Sen. Romney is good at: changing positions and alienating conservatives, and now he is bringing his unique brand of self-promoting flip-flopping to yet another issue,” Club for Growth President David McIntosh said in a statement.

Romney has yet to endorse the House’s impeachment inquiry, but has been one of the most vocal critics of Trump’s calls for Ukraine and China to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE’s family, calling the latter case “appalling.”

His comments have led Trump to directly target Romney on Twitter, calling the senator “a fool who is playing right into the hands of the Do Nothing Democrats.” Romney responded last week, saying he didn’t follow the president on Twitter.

The conservative advocacy group spent millions opposing Trump during the 2016 Republican primaries but has since fallen in line as a pro-Trump operation, according to Politico.

Romney, who was elected to his first Senate term in 2018, will not be up for reelection until 2024, but the ads could send a message to other Republicans considering wavering in their support of the president.