The conservative Club for Growth is going after Sen. Mitt Romney (R-Utah) in a new television ad, accusing the first-term senator and former GOP presidential candidate of siding with Democrats in President Trump’s impeachment proceedings. “There’s Mitt Romney threatening to vote with Democrats again to trot out spotlight-seeking blowhards who will trash President Trump on the witness stand,” a narrator says in the 30-second spot, which is set to begin airing on Fox News on Thursday in Salt Lake City and Washington, D.C.