Larry Klayman, the attorney and activist challenging the U.S. government’s surveillance efforts in court, today told a judge he was eager to begin collecting information and evidence from national security agencies while part of his case is on appeal.

Klayman won a ruling in December from U.S. District Judge Richard Leon that the government’s collection and storage of Americans’ telephone data likely violated individual privacy rights under the Fourth Amendment. The U.S. Department of Justice is appealing Leon’s decision to the U.S. Court of Appeals for the D.C. Circuit.