On Tuesday, former White House counsel Don McGahn appealed a judge's ruling ordering him to comply with a congressional subpoena to testify in the impeachment inquiry. He also asked the judge to prevent him from being forced to testify during the appeal process.
Just 14 hours before the appeal, federal Judge Ketanji Brown Jackson ruled that McGahn must testify and denied that executive privilege makes White House aides "absolutely immune" from congressional subpoenas.
The judge said "it is a core tenet of this Nation's founding that the powers of a monarch must be split between the branches of the government to prevent tyranny."
According to the Justice Department, no appeals court has determined whether the executive branch has the power to stop White House officials when Congress asks them to testify. The department says McGahn has a "significant chance" of winning the appeal.