The Constitution has nothing to do with it.

Submitted by Gee (United States), Dec 14, 2015 at 12:18

These are FOREIGNERS, the Constitution does not apply to them period. The President has the authority to do this exact action under Title 8, Section 1182, which reads in part: (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 non-immigrants, or impose on the entry of aliens any restrictions he may deem to be appropriate.

Previous presidents have not only barred people but deported them even if they became citizens for political views (Communists since Truman, pro Ayatollah Iranians under Carter and Reagan). So yes the president can do this.

Other countries' laws do not matter either. In America only American laws count.

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