I hope it was more than a suggestion. We need the ban, and not just on Muslims but all the criminals flooding this country. If a country is not allowed to ban certain groups, then it is no longer an independent country.
I believe he understands the problem, and I think he's about the only one who will actually deal with it. And, since he's a results-oriented sort of person, he'll not only try but succeed.
But first, he has to get himself elected... so he needs to appeal to as many voters as possible.