In case anyone worried Stephen Colbert was going to go quietly into the night after CBS canceled The Late Show, it’s clear he won’t. In an early clip posted from the show, Colbert responded to President Trump’s gleeful social media post about his firing.

Stephen Colbert had a succinct message to President Trump, one that involved an anatomical impossibility. In his monologue opening Monday’s “The Late Show With Stephen Colbert,” Colbert referred to Trump’s celebrating CBS’s sudden decision to axe the show.

Network late-night shows have been losing viewers for years, but Colbert‘s program is primed for a ratings bump right now.