Twitter may well have destroyed American democracy as we know it, but at least it still serves up some prime GOP-on-GOP beef every now and then. Rep. Adam Kinzinger (R-IL) delivered an absolutely brutal response to his Republican colleague Rep. Matt Gaetz (R-FL) on Tuesday night. It started when Gaetz resurfaced a months-old tweet from Kinzinger backing Rep. Liz Cheney (R-WY) ahead of her expected ousting from her GOP House leadership role this week. Gaetz quote-tweeted Kinzinger’s Cheney support with the barb: “Tweets that don’t age well.” Ten minutes later, Kinzinger shot back: “I’d stay away from ‘aging well’ tweets.” Gaetz is under investigation over allegations involving sex-trafficking and prostitution, including an alleged relationship with a 17-year-old. The Florida congressman has denied the allegations against him.