“Whoops-a-puby, that sure as hell looks legit!” the “Late Show” host says of the president’s alleged signature Stephen Colbert mocked President Trump as he unpacked the president’s alleged birthday letter to the late convicted sex offender Jeffrey Epstein in Tuesday’s “The Late Show” monologue. “The letter he wrote was a Picasso of pervitude,” Colbert said, referring to a letter Trump allegedly sent to Epstein as part of a birthday book for the late financier’s 50th birthday. The letter, which