Attorneys representing Robert Hadden, a former Columbia University obstetrician accused of sexual abuse against dozens of patients, on Monday filed a motion to dismiss his indictment in the U.S. District Court for the Southern District of New York.

Deirdre von Dornum and Michael Weil of the Federal Defenders of New York argued that the indictment, which charged Hadden with six counts of enticement and inducement to travel to engage in illegal sex acts, violated Hadden’s due process rights because he had previously reached a plea agreement with prosecutors in the Manhattan District Attorney’s Office regarding “the same alleged conduct.”