Buried in Judge Jackson's McGahn decision is an affirmation of Congress's inherent contempt power—the power to incarcerate or otherwise punish a recalcitrant witness. Some have suggested that it is dead law, since Congress hasn't exercised that authority in nearly 100 years.

Congress needs to dust off its inherent contempt power. Particularly in light of the statement by Mulvaney that he will continue to abide by Trump’s PLAINLY UNLAWFUL directive not to testify. If Mulvaney follows through with that foolishness, he should be jailed for contempt. https://t.co/bELJmP7MJc

— Glenn Kirschner (@glennkirschner2) November 26, 2019