Donald Trump sexual misconduct allegations
The ruling means the former president could face questions under oath about the sexual assault allegations made by Summer Zervos.
Trump's lawyers are expected to keep fighting the lawsuit.
Judges in New York ruled that the defamation lawsuit from former "Apprentice" contestant Summer Zervos, who accused Trump of groping, can proceed.
The ruling could force Trump to submit to questioning by lawyers for a former "Apprentice" contestant accusing him of sexual harassment.