Clearly the US needs to clamp down on these 1st or 2nd generation emigres who return to their parents' country of origin to radicalize and then come back to the US to commit mass shootings. The Boston Marathon bombers, The Florida bar and the California Christmas party shootings all involved these circumstances.

Pres. Trump has the right intentions, but his approach needs legal fine-tuning so it doesn't encroach constitutional protections.  It was a rookie mistake by a new pres. who will likely get up to speed quickly.