More damaging material is emerging from Donald Trump's reality TV show The Apprentice, with the presidential candidate allegedly using disparaging and insulting comments.

A crew member from the show said: "The Apprentice footage was super vaulted stuff, to keep it from getting into anyone's hands.

"The game-show aspect meant that the footage was locked down super securely."

There were calls for Mark Burnett, who produced The Apprentice, to release unaired recordings of Trump. A source speaking to Buzzfeed said that Burnett, who is in possession of the tapes, "is pro-Trump and has made clear to his teams that he will sue anyone who leaks."

A statement by Burnett was released to Variety on Monday 10 October: "MGM owns Mark Burnett's production company and 'The Apprentice' is one of its properties. Despite reports to the contrary, Mark Burnett does not have the ability nor the right to release footage or other material from 'The Apprentice.'

"Various contractual and legal requirements also restrict MGM's ability to release such material. The recent claims that Mark Burnett has threatened anyone with litigation if they were to leak such material are completely and unequivocally false. To be clear, as previously reported in the press, which Mark Burnett has confirmed, he has consistently supported Democratic campaigns."

A former crew member on The Apprentice, who spoke on condition of anonymity after signing a non-disclosure agreement, said that Burnett guarded the show's footage carefully, to prevent spoilers revealing which contestant had won the reality show.

On Sunday (9 October) Fox News Channel's Geraldo Rivera revealed he also had tapes of "embarrassing" statements made by Trump.

"I have interviewed Donald Trump many times and been with him many times and I have tapes," Rivera said on the network's "The Five" programme. "My brother and I have been starting to go through the tapes now and there are statements that, in the context of the current climate, would be embarrassing." Rivera has not said whether he would release the tapes.