A U.S. Department of Justice lawyer told a D.C. appeals court Thursday that an advocacy group seeking President Donald Trump’s tax returns hadn’t “perfected” its open records request, but at least one judge on the panel appeared skeptical.

Attorneys for the advocacy group Electronic Privacy Information Center and the DOJ sparred before the three-judge panel on the U.S. Court of Appeals for the D.C. Circuit, as part of EPIC’s continued bid to force the IRS to hand over Trump’s tax returns. U.S. District Judge James Boasberg of the District of Columbia tossed its Freedom of Information Act lawsuit last year, a ruling Epic appealed.