None of the hijackers were US citizens. The attack was planned outside the United States. It has nothing at all to do with Muslim immigration. Nothing.
FactCheck.org – 10 May 13
9/11 Hijackers and Student Visas - FactCheck.org
Lawmakers on both sides of the immigration debate have falsely claimed that “some” or “all” of the 9/11 hijackers were in the U.S. on student visas. Only one of the 19 hijackers came to the U.S. on a student visa. The rest arrived here on tourist or...
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It’s okay, though, facts are not your strength.