Unforeseen Contingencies

Well, almost in error.  I hedged "our" position in the previous post sufficiently that I can legitimately claim not to have been in error.

It turns out that what Donald Trump proposes, temporarily banning Muslim aliens from entering the country, already is incorporated in federal law.  (Thanks to Rush Limbaugh for pointing this out.)  More precisely, since 1952, the U.S. Code has given the president full authority to ban and even deport any aliens he deems a threat to the United States.  He can even apply this to all aliens.

No. 8 United States Code, inadmissible aliens: "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."

President Carter seems to have done this with Iranians in 1979.  President Obama seems to be doing this with Middle East Christian refugees... see this and then this.

Christian refugees from the Middle East are unlikely to have any sympathy for sharia, jizya, and the like.  Admitting them while banning Muslims would be quite sensible... and, it appears, legal.