President Donald Trump gave an atta-boy to Republican Rep. Francis Rooney last year on the congressman’s home turf in swing state Florida. “I love it when he defends me,” the president said then. He might feel differently now. The second-term Republican said publicly Friday what others in his party are not, namely that acting White House chief of staff Mick Mulvaney acknowledged a quid pro quo was at work when Trump held up US aid to Ukraine in exchange for Kyiv’s investigation of Democrats and the 2016 elections. Mulvaney later claimed his comments had been misconstrued, but Rooney said he and other Republicans heard them clearly. “He said there’s a quid pro quo,” Rooney said of Mulvaney during a telephone interview. “I just don’t think that the power and prestige of our country is supposed to be used for political things.” Asked whether he thinks Trump’s conduct is impeachable, Rooney replied, “I’m still thinking about it.” Anything short of a “no” on that question, even from only one of 197 Republicans in the House, is notable amid the drive by majority Democrats to impeach Trump. The president has made clear that he does more than notice what he considers acts of disloyalty; he is fond of making examples of Republicans by threatening to sink their re-election bids and following through in a few cases. Friday night, Trump tweeted, “REPUBLICANS MUST STICK TOGETHER AND FIGHT!” That tweet was accompanied by a video targeting Sen. Mitt Romney, R-Utah, who has been critical of Trump’s handling of Turkey’s assault on Syrian Kurds. When Rep. Justin Amash of politically critical Michigan became the first House Republican to call for Trump’s impeachment earlier this year — and quit the party — the backlash from Trump’s orbit was swift. But that was before revelations about Trump’s pressure on Ukraine, which made his impeachment by the end of the year a real possibility. Since the release of a rough transcript of Trump’s call with Ukraine’s president, many current and former administration officials have testified before House impeachment investigators. Then Mulvaney spoke on Thursday. Rooney said in a telephone interview that the chief of staff’s comments marked a turning point for him from giving the president “the benefit of the doubt.” And he said GOP colleagues are newly troubled.