Supreme Court nominee Brett Kavanaugh has being accused of a second allegation of misconduct.
Deborah Ramirez, 53, alleges that the politician, who Donald Trump nominated to become an associate justice, exposed himself to her at a dormitory party during their 1983-84 academic year at Yale.
In an interview with the New Yorker, she claimed Mr Kavanaugh then thrust his genitals in her face without consent.
In a statement provided through the White House, Mr Kavanaugh said the event "did not happen" and that the allegation was "a smear, plain and simple".
A White House spokeswoman added in a second statement that the allegation was "designed to tear down a good man."
It follows another accusation made by Professor Christine Blasey Ford, who has claimed Mr Kavanaugh tried to take off her clothes at a party in 1982, when she was 15 and he was 17.
She also claimed he pinned her to a bed and covered her mouth.
Dr Ford, a 51-year-old California psychology professor, and Mr Kavanaugh will both appear in front of the Senate Judiciary Committee on Thursday, at separate points, to discuss the former’s accusations. Mr Kavanaugh denies the allegations against him.
The developments could impact the decision of Mr Kavanaugh becoming a member of the top court in the US.
To be able to fill the vacant Supreme Court seat he must be approved by the Senate Judiciary Committee, which is made up of 21 members, before the whole senate then has a say.
Senator Dianne Feinstein of California, the ranking Democrat on the Judiciary Committee, called for the "immediate postponement" of any further action on Mr Kavanaugh's nomination.
She also asked the committee's chairman, Senator Chuck Grassley to have the FBI investigate the allegations of both Ms Ford and Ms Ramirez.
