President Donald Trump on Friday announced an executive action that freezes entry to the U.S. for 90 days for anyone from Syria, Iraq, Iran, Sudan, Libya, Somalia or Yemen, and indefinitely bars Syrian refugees from relocating here.

The policy also applies to U.S. legal permanent residents and visa-holders from those countries, some of whom were traveling at the time of the announcement and will require a case-by-case waiver for re-entry. Trump cited fear of terrorism from the majority-Muslim countries included in the order, which also froze a U.S. Refugee Admissions Program for 120 days.

The announcement on Friday night promptly caused confusion and anger from those affected, including from people who were completing the final stages of the relocation process. An unknown number of refugees and immigrants were detained at U.S. airports on Friday and Saturday as legal advocates rushed to their aid.

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