It has been done before, by FDR and after WW2, it was the democrats and a democrat president that passed the law. Here is number eight US Code 1182, inadmissible aliens. This law was written in 1952. It was passed by a Democrat-controlled Congress, House and Senate, and signed by a Democrat president: "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, 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." I decided to make a separate thread about this because the mainstream media is running a propaganda campaign that tries to brainwash people into believing that what Trump is proposing is somehow "unconstitutional" and other forum members continue to spread this blatant misinformation. What Trump is proposing is legal and plain common sense.