A federal magistrate judge in California on Wednesday granted the National Labor Relations Board permission to issue nationwide subpoenas to investigate whether Uber drivers who brought complaints against the ride-hailing company are statutory employees with the ability to sue under the National Labor Relations Act.

U.S. Magistrate Judge Sallie Kim of the Northern District of California cited Uber Technologies Inc.’s failure to comply with rules about objections to agency subpoenas. She also pointed to the relevance of the labor board’s nationwide request.