Depending on the criteria, absolutely! Even if the number stopped is small in proportion, it makes sense. Of course, if that criteria is strictly based on a country, i think there needs to be more criteria than that. Countries with termoil have refugees as well as potential terrorists. The refugees would probably like nothing better than to stay in their country, but circumstances prohibit it (Myanmar, Syria, etc. While i am NOT for the border wall, nor am i for open borders. There needs to be rules in place.