(CNN) Leland Ingham Keyser, a friend of the woman accusing Supreme Court nominee Brett Kavanaugh of sexual assault when they were at a party in high school, does not refute the veracity of the allegation, although she does not remember the alleged incident, her lawyer said in a letter to the Senate Judiciary Committee.

The accuser, Christine Blasey Ford, claims that during a party in the early 1980s at which Keyser and several others were present, Kavanaugh drunkenly pushed her into a bedroom, pinned her down and attempted to remove her clothes before she was able to escape. Kavanaugh has vehemently denied the allegation.

"Ms. Keyser does not refute Dr. Ford's account, and she has already told the press that she believes Dr. Ford's account," Keyser's attorney, Howard Walsh, wrote in the letter, which was sent to the committee overnight Friday. "However, the simple and unchangeable truth is that she is unable to corroborate it because she has no recollection of the incident in question."

Walsh also said in the letter that Keyser will "cooperate fully" with an FBI investigation into the allegation.

The letter comes after emotional testimony from Ford and Kavanaugh about the allegation at a committee hearing Thursday. Keyser felt the need for the letter, Walsh wrote, to clarify a previous statement about the allegation, which came up at the hearing and which she believed made it sound as if she did not believe the party had occurred.