Excluding immigration from specific countries is the president’s call - as CnC ... Congress has nothing to say about it. Otherwise these gaggle of fools we presently have would not be so up in arms. My guess is the establishment numb nuts are scared s**tless of Trump, because they know that if he gets the Presidency, their days of PC game playing are over.
Sorry. Constitutionally, immigration policy is the exclusive province of the Congress.
The president is responsible for foreign policy -- as president, not as C-in-C -- which is distinct from immigration policy.