A former White House volunteer, Ms Kathleen Willey, testified that President Clinton tried to kiss her on the lips and put her hands on his aroused genitals at a meeting in the White House in November 1993.
In his own deposition, available yesterday from lawyers for Ms Paula Jones, Mr Clinton said he might have kissed her on the forehead. He denied putting her hand on his penis.
Ms Willey, in a deposition taken in Richmond, Virginia, in January and released yesterday, said the incident took place in a doorway to the side of the Oval Office when she went to tell the President that she needed a paid job.
She said they were on their way back to the Oval Office after drinking coffee in a small private office when Clinton hugged her and said the White House would try to help her. "The hug just continued longer than I expected . . . I felt it was more than just a platonic hug," she said.
"He attempted to kiss me," she added. Asked if he tried to kiss her on the lips, she said, "Yes. He put his hands - he put my hands on his genitals . . . It was very unexpected," added Ms Willey, who was 51 at the time.
The President was "aroused" and Ms Willey withdrew her hand and broke out of his embrace, she said. Mr Clinton did not resist her attempt to move away, she added.
Ms Willey, who appeared before Mr Starr's grand jury on Tuesday as a co-operative witness, has been interviewed for the CBS News programme, 60 Minutes, to be broadcast on Sunday.
President Clinton, giving his own version of the incident in his deposition in January, said: "I embraced her. I put my arms around her. I may have even kissed her on the forehead. There was nothing sexual about it."
Asked whether he put her hand on his penis, he said: "I emphatically deny it. It did not happen."
Joe Carroll adds: Lawyers for Ms Jones yesterday released previously sealed documents setting out details of her action for sexual harassment against President Clinton.
The President's lawyer, Mr Bob Bennett, said it was clear from these documents that Ms Jones "has no case, suffered no damage and was never harassed". He described the filing as a "scurrilous" paper and showed that "the Clinton-haters are trying to hound him out of office".