The anger over CBS’ decision to shutter The Late Show with Stephen Colbert continues: On Monday, protesters gathered outside the Ed Sullivan Theater in New York City to shout “Colbert Stays! Trump Must Go!

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.