Donald Trump denies knowing of payment to Stormy Daniels

US President Donald Trump says he did not know about a US$130,000 (NZ$179,000) payment made by his lawyer to adult film star Stormy Daniels to keep quiet about a sexual encounter she says she had with Mr Trump.

In his first public remarks about Ms Daniels' allegations, Mr Trump said aboard Air Force One on Thursday (local time) that he did not know where his lawyer, Michael Cohen, got the money to pay Ms Daniels.

Mr Cohen has said he paid Ms Daniels out of his own pocket.

"No, I don't know," Mr Trump told reporters when asked if he knew where the money came from.

Ms Daniels, whose real name is Stephanie Clifford, last month sued Mr Cohen to be released from the non-disclosure agreement she signed in October 2016 in exchange for the payment from him.

The White House has denied that Mr Trump had sex with Ms Daniels.

Ms Daniels has said she and Mr Trump had sex once in 2006, when he was married, but that they kept in touch for a period of time.

Reuters