Comedian David Letterman on Friday joined the chorus of late-night hosts to bash CBS News after it announced it would sunset “The Late Show” after more than three decades on air, while praising host Stephen Colbert as a “martyr.

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.