The "policy" is an unenforceable farce.  It empowers every customs and immigration agent with powers that should be reserved for those with significantly more education and intelligence.
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Only those who enjoy being embarrassed and humiliated by dictatorial TSA personnel can support an edict promulgated by Rudolph William Louis Giuliani who has proudly stated:
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"I’ll tell you the whole history of it: When he (Trump) first announced it, he said ‘Muslim ban,'" 
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"He called me up, he said, ‘Put a commission together, show me the right way to do it legally.’"
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Legal religious discrimination...somewhere The Founders are weeping...