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.

David Letterman didn't hold back in calling out Paramount for acting out of "cowardice" in canceling his former CBS program, "The Late Show."

CBS said the cancellation wasn't related to "content or other matters happening at Paramount." Paramount controversially agreed to settle a lawsuit brought by Trump over a "60 Minutes" interview with then-presidential candidate Kamala Harris.