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

Sandra Oh criticized CBS and Paramount during her appearance on 'The Late Show with Stephen Colbert' on July 21 after its cancellation was announced. The network said it was "a financial decision," but the news came days after Colbert criticized Paramount for its $16 million settlement with President Donald Trump.

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.