Holding arguments by phone, the US Court of Appeals for the District of Columbia Circuit considered whether a House committee can sue to enforce a subpoena for testimony from former White House Counsel Donald McGahn.

"Disputes between the political branches about their institutional prerogatives have occurred since the founding, but lawsuits between them are a novel and unsanctioned tactic," Hashim Mooppan, a Justice Department lawyer arguing for the Trump administration, told the court.

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