Failure to comply with a subpoena also could lead to Mnuchin being held in contempt of Congress, along with a court order of daily fines or even jail until he does comply, experts say. “To me the person who’s most vulnerable to this is Mnuchin because, of course, the statute directs Mnuchin to do something, so if he doesn’t comply then he’s the one in violation,” said George K. Yin, a professor at the University of Virginia School of Law and former chief of staff of the Joint Committee on Taxation.