Or they have to release a “Vaughn Index” listing the individual documents and the reasons why they are not being released. From the Daily Caller:

The Obama administration lost a crucial legal battle on July 18 when a federal court ordered the White House to release previously withheld information on Operation Fast and Furious to the government watchdog group Judicial Watch.

According to a press released issued Thursday, the court case stems from a Freedom of Information Act lawsuit (that originally began as a FOIA request) filed by Judicial Watch in 2012 to obtain all documents that the president has withheld from Congress under claims of executive privilege.

The decision, issued by the U.S. District Court for the District of Columbia, would require the Department of Justice to turn over a “Vaughn Index” to Judicial Watch for the documents the group requested.

The DoJ has until October 1st to comply.