Donald Trump is no stranger to controversy. In fact, he craves it. His most recently controversial statement, however, has raised an interesting constitutional question: Would it be constitutional to exclude all Muslims from entering the United States? (for a primer on this issue in German see "Trump für komplettes Muslim-Einreiseverbot in die USA"). Interestingly, there is a split of opinion among American academics regarding this question, and one of the reasons is a case that was discussed here early this month. For a taste of the some of the conflicting views regarding this question see here, here and here.