The White House and Trump's attorney have denied that the president had a sexual relationship with Clifford. Trump's personal lawyer, Michael Cohen, says he "facilitated" the $130,000 payment with his personal funds and was not reimbursed by the Trump Organization or the campaign.
The White House and Cohen did not immediately respond to request for comment about the polygraph results.
Also on Tuesday, a former Playboy model who alleged she had an affair with Trump sued to be released from the 2016 agreement she signed with American Media Inc., the parent company of the tabloid The National Inquirer, NBC News confirmed.