While countries that have had citizens kill thousands of Americans are excluded (These are also countries where Trump has business interests...)
http://www.nydailynews.com/news/politics/trump-muslim-ban-excludes-countries-linked-businesses-article-1.2957956

President Trump’s most recent executive order effectively bans citizens of seven Muslim-majority countries from entering the U.S. for at least 90 days — but some Muslim countries were spared from the order's blacklist, even though they have deep-seated ties to terrorism.

Conspicuously, Trump doesn't hold any business interests in any of the countries on the list, but holds major stakes in several of those excluded from it, records show.

Friday’s executive order, signed at the Pentagon, suspends the issuing of U.S. visas or travel permits to people from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.

Not a single American was killed on U.S. soil by citizens from any of those countries between 1975 and 2015, according to statistics tallied by the conservative-leaning Cato Institute.

Upon the resumption of USRAP admissions, the Secretary of State, in consultation with the Secretary of Homeland Security, is further directed to make changes, to the extent permitted by law, to prioritize refugee claims made by individuals on the basis of religious-based persecution, provided that the religion of the individual is a minority religion in the individual’s country of nationality.

As a general matter, this will give priority to Christian refugees over Muslim ones. Though framed in a neutral way, this part of the order may raise questions of religion-based discrimination. Mr. Trump has said that he means to favor Christian refugees.

That violates the First Amendment’s ban on government establishment of religion, according to David Cole, the legal director of the American Civil Liberties Union. “One of the critical questions with respect to the validity of executive action challenged under the Establishment Clause is its intent and effect,” he wrote in a blog post. “If intended to disfavor a particular religion, it violates the Establishment Clause.”