CNN sued the FBI for access to case files and other documents related to interviews with about 500 witnesses questioned during Special Counsel Robert Mueller’s Russia probe.

The Federal Bureau of Investigation failed to respond to CNN’s Freedom of Information Act request for the documents, known as "302s," the news organization said in a suit filed Tuesday in Washington. CNN is seeking a court order forcing the FBI to hand the documents over.

"Despite numerous citations to 302s and other underlying documentation throughout the publicly-released version of the Special Counsel’s Report –- including many direct quotes from documents themselves –- the FBI has failed to respond to CNN’s request for the report’s underlying evidence and factual findings within the time required by the FOIA."

Now that Mueller’s two-year investigation into Russia’s interference in the 2016 election is over, Democrats and news organizations have been battling for access to Mueller’s underlying research and findings, including grand jury materials. Attorney General William Barr, who oversees the FBI, has largely balked.

"CNN seeks to fulfill its journalistic function and provide the public with documents detailing the Special Counsel’s unprecedented investigation of the highest-ranking officials in the U.S government –- the president and his staff,” the network said.

Separately, BuzzFeed Inc. sued Wednesday for all final and draft talking points and any legal guidance prepared for Barr for his April 18 press briefing before the release of the Mueller report.

The FBI didn’t immediately return a request for comment on the lawsuits.