Adult-film star Stormy Daniels is scheduled to sit down with prosecutors on Monday in regard to Michael Cohen's $130,000 payment for her silence about her alleged affair with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, according to The Washington Post.

A source told the publication that the interview between Daniels, whose real name is Stephanie Clifford, and prosecutors from the Southern District of New York was part of preparation for a potential grand jury appearance from Cohen.

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The source told the Post that Daniels and her lawyer, Michael Avenatti, have cooperated with prosecutors and handed over documents connected to the payment, which was made in the run-up to the 2016 presidential campaign.

Cohen said in an interview in March that the payment was not related to the campaign.

The documents were reportedly provided in response to a subpoena.

Cohen is currently under investigation in New York for a number of alleged financial crimes.

The FBI raided Cohen's home, office and hotel room in April as part of the probe.

Some of the materials taken in the raid were reportedly connected to Cohen's payment to Daniels.

Trump has acknowledged that he reimbursed Cohen, his longtime attorney, for the payment, which was made to Daniels not long before the 2016 presidential election. But Trump has denied that the affair with Daniels took place.

Cohen has denied wrongdoing in the case and has not been charged with a crime.

Daniels has filed defamation suits against Trump and Cohen.

She sued Trump over the agreement, claiming it is void because he never signed it. She later amended the lawsuit to include the defamation charges against Cohen.

Cohen in April invoked his Fifth Amendment rights in the suit, saying he could not effectively defend himself because it might incriminate him in the federal case.