Well stated, Jeff. You made a perfect case.
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, the president 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.
That pretty much is game, set, match regarding this issue. It never was an issue.