Adult film star Stormy Daniels says she was threatened to keep quiet, about claims she had sex with Donald Trump before he was president.

Daniels told 60 Minutes on Sunday in 2011, a man who she didn't know confronted her and said: "Leave Trump alone. Forget the story."

She says she didn't go to the police because she was afraid and called the encounter a "direct threat."

Her story gained traction after the Wall Street Journal reported Trump's personal lawyer Michael Cohen paid her $130,000 to stay quiet.

However recently she's declared that deal with Cohen is invalid because the president never signed it.

The White House and Cohen deny the alleged affair took place.

However the lawyer has not explained why he made the payment - or whether Trump was aware of it.

Sunday was actually the second tell-all TV interview in a week involving claims of a Trump affair.

Playboy model Karen McDougal told CNN about a 10-month long affair with him beginning in 2006.

Trump would have been married to his wife Melania during both alleged relationships.

The president did not respond to reporters asking whether he would watch the 60 Minutes segment and he hasn't directly commented on the allegations.

However his longtime friend - media exec Christopher Ruddy - told ABC news Trump has called them a 'political hoax.'

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