The statement "ban all Muslims from entering the United States" would certainly describe unconstitutional action IF it meant barring Muslims who are U. S. citizens from entering the U.S. or if it meant barring people with green cards or other valid permission. But there is no constitutional guarantee that allows non-citizens of the U. S. of any racial or religious group entry into the U. S. There may be statutory rights related to  immigration with regard to things like family reunification in some cases, but nothing in the U. S. Constitution.