Don McGahn Appeals Ruling That He Must Obey Congress' Subpoena

A judge ordered compliance with a congressional subpoena for testimony in an impeachment inquiry. The individual sought to delay testimony during the appeal process, but a federal judge ruled against the use of executive privilege to avoid testifying. The judge emphasized the importance of separating powers to prevent tyranny. The Justice Department noted that no appeals court has decided if the executive branch can stop White House officials from testifying, but believes there is a significant chance of winning the appeal.

What does the judge say about executive privilege in relation to congressional subpoenas?

What chance does the department say McGahn has regarding the appeal?