The Senate Judiciary Committee is looking into another misconduct claim against Supreme Court nominee Brett Kavanaugh, NBC News reports. The allegation was made in an anonymous letter to Sen. Cory Gardner (R-CO) that accuses Kavanaugh of physically assaulting a woman in 1998 while drunk in the Washington, D.C., area. The parent of a woman who witnessed the alleged incident reportedly penned the complaint. “When they left the bar (under the influence of alcohol), they were all shocked when Brett Kavanaugh shoved her friend up against the wall very aggressively and sexually,” the letter reportedly says. “There were at least four witnesses including my daughter.” Kavanaugh was asked about the allegation by Republican Senate investigators during a phone call Tuesday, and he denied the allegations, according to NBC News. “We have no reason to assign the letter credibility, and even if we did, we’d have no way to investigate the allegation as it was made anonymously and cannot be corroborated,” said Taylor Foy, a spokesman for the GOP side of the judiciary committee. Three women have accused Kavanaugh of sexual misconduct, including Christine Blasey Ford, who alleges that the Supreme Court nominee sexually assaulted her when they were both in high school. Kavanaugh has denied all the allegations.