Since then, Colbert has been ripping into Donald Trump with renewed relish, often while also flaying CBS and its parent company, Paramount. By doubling down on attacking his most powerful enemy, at a time when network execs are facing such intense scrutiny for what many believe was a politically motivated firing,

Letterman, like other press advocates and some Democrats, did not seem satisfied with that answer.

Letterman surmised that Colbert's firing was so the $8 billion merger would be approved by the Trump administration.