A federal court is set to hear oral arguments on the National Security Agency’s blanket collection of telephone data next month.

In a hearing in Washington on Wednesday, D.C. District Court Judge Richard Leon asked attorneys to return to make their case against the practice on Oct. 8. Leon had issued a previous injunction against the NSA’s collection of telephone metadata on behalf of plaintiff Larry Klayman, a conservative lawyer and activist, in 2013. But that was overturned last month by the U.S. Court of Appeals for the District of Columbia.