The Obama administration has failed to turn over documents under public-records requests detailing still-secret court orders about the scope and legality of National Security Agency surveillance, according to a lawsuit filed Thursday in federal court.

The Electronic Frontier Foundation, a civil liberties group, said the Justice Department failed under its legally prescribed deadline to hand over documents in four requests since last year under the Freedom of Information Act. The requests sought, among other documents, secret opinions from the Foreign Intelligence Surveillance Court exploring whether the NSA violated the law in collecting Americans' Internet communications.

A Justice Department spokesman said Thursday that the agency was "committed to a transparent and open government, and makes every attempt to comply with Freedom of Information requests in a timely and efficient manner while ensuring that classified or sensitive information is not improperly released."

The lawsuit comes at a time when the president has promised to be more transparent on how the intelligence agencies conduct surveillance. As part of its response to the fallout from former NSA systems analyst Edward Snowden's disclosures, the administration has declassified hundreds of pages of documents regarding the secret surveillance programs, including many of the surveillance court opinions.

The Electronic Frontier Foundation has aggressively sought access to the secret court's records, and some recently disclosed documents were the result of those lawsuits. EFF's most recent FOIA requests, among those challenged Thursday in U.S. District Court in Washington, also sought opinions from the secret appeals court and, if any were to exist, at the Supreme Court.