A federal appeals court in Washington heard warnings Friday that how they rule in the House Judiciary Committee’s legal fights for information from the Trump administration could spark an avalanche of congressional lawsuits, or even a potential gunfight between the House sergeant at arms and the FBI security detail for Attorney General William Barr.

Two separate panels of the U.S. Court of Appeals for the District of Columbia Circuit heard nearly three hours of oral argument on two committee cases related to former Special Counsel Robert S. Mueller III’s report on Russian interference in the 2016 election. Both were filed months before the House voted to impeach President Donald Trump on his dealings with Ukraine.

[House contends it still needs court help to get Mueller info]

The committee filed a lawsuit to force former White House Counsel Don McGahn to testify about episodes from Mueller’s report. In the other case, the committee wants access to secret grand jury materials from that same investigation.

Lower courts have ruled that McGahn must testify before the committee and the Justice Department must give the grand jury material to the committee. The D.C. Circuit panels can now decide at any time whether those rulings were right.