You mean U.S. law agrees with Trump?

Title 8, Section 1182 of the U.S. Code provides in relevant part:

"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."

https://www.law.cornell.edu/uscode/text/8/1182

Linked from a Vast Right-Wing Conspiracy site, which I X’d out of and then could not find again.