Kevin McCarthy is escalating his revenge campaign against Rep. Matt Gaetz. In an interview with POLITICO, McCarthy backed Gaetz’s new Florida GOP primary challenger; a top McCarthy adviser also acknowledged playing a role in vetting that opponent, Aaron Dimmock. And McCarthy delivered a slashing attack on Gaetz, who led the effort to overthrow him as speaker last fall. “Gaetz is the Hunter Biden of the Republican Party,” McCarthy said. “He’s got an opponent who is pro-life, pro-Second Amendment, trained at Pensacola, went to the Naval Academy and flew jets to defend us while Gaetz was getting kicked out of high...