David Letterman delivered a fiery rant against CBS and parent company Paramount for cancelling Stephen Colbert’s “Late Show,” calling the decision “gutless” and “pure cowardice” as he labeled his successor a martyr of the network.

Has even less talent than Colbert! Greg Gutfeld is better than all of them combined, including the Moron on NBC who ruined the once great Tonight Show.” Below, find responses from Jimmy Fallon, Jimmy Kimmel,