A Jeffrey Epstein accuser who said she was forced to have sex with Alan Dershowitz may proceed with a defamation suit against the famed law professor, but she would have to do so without the representation of her longtime attorneys, a Manhattan federal judge ruled on Wednesday.

U.S. District Judge Loretta A. Preska of the Southern District of New York said Boies Schiller’s  disqualification was “clearly required” under the witness-advocate rule, which bars attorneys from participating in cases where other lawyers in their firm might be called as witnesses.