Donald Trump made immigration and refugee policy central to his presidential campaign. According to Trump, radical Islamic extremism and the massive refugee flows out of the Middle East combined to created unacceptable risks. Following the December 2015 mass shooting in San Bernadino, California, the Trump campaign called for “a total and complete shutdown of Muslims entering the United States until our country’s representatives can figure out what is going on.”[1] Trump insisted that his proposal would buy time to review and improve the process for screening new arrivals. He mocked the idea that U.S. procedures for vetting refugees were sufficient to stop terrorists from entering U.S. soil, and he promised to take swift action upon entering office.

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