Apropos all the recent fuss:
8 U.S.C. § 1182(f), as currently posted by the Government Printing Office is the enabling statute (check it for yourself):
“(f) Suspension of entry or imposition of restrictions by President
Whenever the President finds that the entry of any aliens or of any class of aliens into the United States would be detrimental to the interests of the United States, he may by proclamation, and for such period as he shall deem necessary, suspend the entry of all aliens or any class of aliens as immigrants or nonimmigrants, or impose on the entry of aliens any restrictions he may deem to be appropriate.”
This is what is called “black letter law” and to this High School Graduate seems pretty straightforward, but I’d be pleased to listen to any argument to the contrary that doesn’t smell like politics.