Morgan went on to berate De Niro for his behaviour towards journalists.
"He's renowned as the rudest, most difficult and frankly obnoxious star to interview, possibly in the history of Planet Earth. A man so consumed with his own sense of self-importance that even offering a modicum of consideration towards those charged with trying to help him promote his own movies is beyond him," wrote Morgan.
Morgan said his interview with De Niro for CNN "was a bloody nightmare" and he'd "have had an easier job extracting teeth from a Pitbull" than getting any quotes from the actor.
"He should stop behaving like a pathetic prima donna and show some damn courtesy to those inflicted with the unenviable hell of having to talk to him."
Morgan then called for a De Niro interview ban.
Read more: Hollywood's most cringeworthy interviews
"Every journalist in the world should agree, with immediate effect, never to interview him again."Let's see how that goes.
- AAP