Weinstein's attorneys argued in court filings that the case had been "irreparably tainted" by a detective's alleged coaching of a potential witness and one of the accusers. They also said the grand jury should have been shown evidence that Weinstein had exchanged friendly emails with his two accusers after the alleged attacks.
Prosecutors, however, said there is ample evidence to move the case to trial, even after part of the case was dropped in October.
Weinstein turned himself in to authorities in May to face charges including rape, sexual abuse and sexual misconduct.
Weinstein is accused of raping a woman in a hotel room and forcing another to perform oral sex in his apartment, according to the AP. Weinstein has denied all allegations of nonconsensual sex.
Several celebrities have accused Weinstein of various inappropriate, sexual acts. Their speaking out sparked the #MeToo movement.
The Associated Press contributed to this report.