The U.S. Supreme Court is preparing to weigh in on one of the most significant legal power plays in recent memory: whether individual federal trial judges can continue issuing nationwide injunctions that derail national policy. The high court’s move could mark a turning point in the Trump administration’s effort to rein in what it sees as activist judges stifling the will of the elected government. John Yoo, a law professor at UC Berkeley and former Justice Department official, broke down the issue during an appearance on Fox News, where he explained the gravity of the situation and why the Supreme...