Section 212(f) of the Immigration and Nationality Act (INA) gives the President of the United States broad authority to implement immigration restrictions by proclamation. The statute allows the President to suspend the entry of any aliens or of a class of aliens or place restrictions on the entry of a class of aliens temporarily if he or she determines that the entry of such aliens would be detrimental to the U.S. interest.What the heck is he waiting for!
I honestly don't know.
I guess the same reason that Clapper, Brennan, Powers, Jarrett, Podesta, Comey, Lynch, Schiff, Yates, Rosenstein, McCabe, Ohr, Priestap, Strzok, Page, Hillary, and Obama haven't been arrested yet.
Because... ...well... ..uhhhh ...give me a minute, I'll think of something.