ERIC POSNER: IS AN IMMIGRATION BAN ON MUSLIMS UNCONSTITUTIONAL? “Probably not.” Which isn’t to say that it’s a good idea, only that people referencing the “religious tests” provision (which applies only to public office) or the Establishment Clause don’t know what they’re talking about.

Related: “Restricting immigration was as central to the progressive agenda as regulating railroads.” Donald Trump as Woodrow Wilson? Well, he’s certainly no Warren Harding.