A federal judge Thursday ordered at least one official from Elon Musk’s Department of Government Efficiency to testify and provide documents in response to a lawsuit against the Trump administration by the American Federation of Labor and other unions.

It will be the first time someone involved with DOGE has been required to answer questions under oath from an attorney outside the government, potentially providing new insights into the operations of an organization that U.S. District Judge John Bates of Washington, D.C., characterized as “opaque” in his order.

The unions that filed the lawsuit are seeking to block DOGE from accessing Labor Department data, arguing that access to such sensitive information systems would violate the Privacy Act and the Administrative Procedure Act.