Louis CK regrets comparing Donald Trump to Hitler. But he's not going to take it back.Subscribe To "The Late Show" Channel HERE: http://bit.ly/ColbertYouTubeFor more content from "The Late Show with Stephen Colbert", click HERE: http://bit.ly/1AKISnRWatch full episodes of "The Late Show" HERE: http://bit.ly/1Puei40Like "The Late Show" on Facebook HERE: http://on.fb.me/1df139YFollow "The Late Show" on Twitter HERE: http://bit.ly/1dMzZzGFollow "The Late Show" on Google+ HERE: http://bit.ly/1JlGgzwFollow "The Late Show" on Instagram HERE: http://bit.ly/29wfREjFollow "The Late Show" on Tumblr HERE: http://bit.ly/29DVvtRWatch The Late Show with Stephen Colbert weeknights at 11:35 PM ET/10:35 PM CT. Only on CBS.Get the CBS app for iPhone & iPad! Click HERE: http://bit.ly/12rLxgeGet new episodes of shows you love across devices the next day, stream live TV, and watch full seasons of CBS fan favorites anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B---The Late Show with Stephen Colbert is the premier late night talk show on CBS, airing at 11:35pm EST, streaming online via CBS All Access, and delivered to the International Space Station on a USB drive taped to a weather balloon. Every night, viewers can expect: Comedy, humor, funny moments, witty interviews, celebrities, famous people, movie stars, bits, humorous celebrities doing bits, funny celebs, big group photos of every star from Hollywood, even the reclusive ones, plus also jokes.