Another reason this EO is unconstitutional:

President Trump signed an executive order on Friday that purports to bar for at least 90 days almost all permanent immigration from seven majority-Muslim countries, including Syria and Iraq, and asserts the power to extend the ban indefinitely.

But the order is illegal. More than 50 years ago, Congress outlawed such discrimination against immigrants based on national origin.

The Immigration and Nationality Act of 1965 banned all discrimination against immigrants on the basis of national origin, replacing the old prejudicial system and giving each country an equal shot at the quotas. In signing the new law, President Lyndon B. Johnson said that “the harsh injustice” of the national-origins quota system had been “abolished.”