April 28 (UPI) -- A federal appeals court on Tuesday will hear arguments about whether former White House counsel Don McGahn must obey a congressional subpoena to testify about President Donald Trump's actions on immigration and the Russia investigation.
The nine-judge U.S. Court of Appeals for the District of Columbia Circuit will convene via teleconference to hear a case seen as one of the most important concerning the ability of Congress to effectively check the executive branch.