For the second appearance in a row C.K. was wearing a suit.
Louis C.K. regrets sending a scathing letter to fans a year ago about then-candidate Donald Trump.
During the election, Louis C.K. called Donald Trump an "insane bigot" and "Hitler". Louis didn't expect his words to become front page news, but he doesn't regret his fiery diatribe against the candidate.
He continued: "I thought he was some new kind of evil but he's just a lying sack of shit".
"Someones people lie - 'That guy lied, they found out he lied.' Then there's somebody who lies once in a while and can't quite stay inside the boundaries of truth". "It was amusing for a little while".
Tell us what you think!
He explained the difference between people who occasionally tell lies and people who seem to enjoy telling lies.
"Then you have a liar, somebody who it's nearly like a problem, they lie a lot". They lie a lot. He goes, 'Heh heh, it wasn't even true.
"Then you have a lying sack of s-t", he said to applause from the audience, referring to the president.
"Then you have just a lying sack of shit", he said of Trump. He also said that even though he loved former President Barack Obama, he also took a number of decisions that the country should not be proud of.