The late-night legend took aim at his former network home and David Ellison's media company, speculating that Colbert's show was canceled for political reasons.

"The people at CBS who have manipulated and handled this are going to be embarrassed,” the former 'Late Show' host says. “This is gutless”

David Letterman took aim at his former employer, CBS, over the cancellation of 'The Late Show With Stephen Colbert.