Trump230.jpgAll sorts of celebs are weighing in on The Donald as of late ... and they have some not-so-nice things to say about The Apprentice host and potential presidential candidate.

Comedian Bill Cosby spoke to NBC about Trump's possible 2012 campaign.

    "He’s full of it,” Cosby said. “You run, or shut up … but the only thing he's running is his mouth."

And Robert De Niro said Trump is like a "used car salesman" when it comes to the businessman's questioning of President Obama’s birth certificate.

Last, Jerry Seinfeld pulled out of an event benefiting St. Jude Children’s Research Hospital because Trump’s son, Eric, was hosting it.

But Trump, who's used to being the one giving the criticism a la his Apprentice franchise, doesn't take such critiques lightly.

See what fightin' words he had in response to these three -- and the bizarre statement that one celebrity gave in support of Donald -- after the jump!