U.S. President Donald Trump is calling for late-night host Stephen Colbert to be taken off the air immediately, referring to him as a "dead man walking." "Stephen Colbert is a pathetic trainwreck, with no talent or anything else necessary for show business success," Trump wrote. "Now, after being terminated by CBS, but left out to dry, he has actually gotten worse, along with his nonexistent ratings."Trump said Colbert is "running on hatred and fumes.""A dead man walking! CBS should, 'put him to sleep,' NOW, it is the humanitarian thing to do," Trump added to his midnight diatribe.