A Washington subpoena fight is bubbling over whether the intelligence company behind the salacious Trump-Russia dossier should have to turn over documents in a defamation case against BuzzFeed.

The underlying case in Miami federal court was filed by a Russian tech executive accused in the BuzzFeed-published dossier of hacking into Democratic Party leadership to help get President Donald Trump elected. The series of memos in the dossier were prepared by the Washington intelligence company Fusion GPS, a nonparty to the lawsuit that argues it shouldn’t have to reveal its sources or internal documents and communications.