Executive Order 13769
Trump campaign and administration statements before the order's signing

In a speech on August 15 Trump listed terrorism attacks in the United States (9/11; the 2009 Fort Hood shooting; the Boston Marathon bombing; the shootings in Chattanooga, Tennessee; and the Orlando nightclub shooting) as justification for his proposals for increased ideological testing and a temporary ban on immigration from countries with a history of terrorism; on this point, the Los Angeles Times ' analysis observed Trump "failed to mention that a number of the attackers were U.S. citizens, or had come to the U.S. as children". (The same analysis also acknowledged an act of Congress eventually cited to in the executive order was probably what Trump would attempt to use in implementing such proposals. No deaths in the U.S. had been caused by extremists with family backgrounds in any of the seven countries implicated by the executive order as of the day before it was signed.) In the speech, Trump vowed to task the departments of State and Homeland Security to identify regions hostile to the United States such that the additional screening was justified to identify those who pose a threat.
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