Adult film star Stormy Daniels' lawyer asked a federal judge for permission to question U.S. President Donald Trump under oath over an agreement to keep her quiet before the 2016 election about their alleged sexual relationship.

The White House has denied that Trump had sex with Daniels. She sued Trump on March 6, saying he had not signed a $130,000 agreement for her to stay silent, so it was invalid. Daniels, whose real name is Stephanie Clifford, and her lawyer have also said the payment was an illegal campaign contribution.

Lawyer Michael Avenatti filed a motion in U.S. District Court in Los Angeles asking the court to allow depositions of Trump and Trump's personal lawyer, Michael Cohen.