The judges were wrong to base their decisions in part on the leaked document. President Trump had clear constitutional and statutory authority to issue the travel order, and whether the judges, or some anonymous person at DHS, agreed with his judgment is irrelevant. But Leahy skillfully unpacks what happened here. The draft report came from DHS’s Office of Intelligence and Analysis, which was headed by David Grannis, an Obama holdover bureaucrat. Grannis is a partisan Democrat who previously worked as a staffer for Democrats Dianne Feinstein and Jane Harman. A DHS spokesman “would neither confirm nor deny that Grannis was...