The Hill News

Sen. Rand Paul (R-Ky.) jokingly swiped at late night talk show host Dave Letterman Thursday night, invoking the advice of a comedian-turned-senator.

During his appearance on the "Late Show," Paul and Letterman struck up a conversation about how they both know former "Saturday Night Live" cast member Sen. Al Franken (D-Minn.)

After Paul described Franken as his "mentor," Letterman asked if he had any advice for Paul about appearing on the show.

"Yeah, he said don't," Paul replied.

"Now, he did say it was fine to come on here. He said don't worry. He said he's been on your show," Paul continued. "He said, 'Letterman is not that funny first of all.' And then he said, 'As long as you're not funnier than him, not a big deal. But then he also said, "P.S. Don't tell Letterman I said he's not funny.'"

"I may be in trouble now," he said.