It is useless to ban people of a certain faith from entering a country in this situation. I.S. and these extremists' views and beliefs cross borders like terrorism has never done before. These ideologies are not just based in these high risk countries, but spread through the internet, deep web, and even ps fucking 4. These beliefs wont be stopped but just stopping muslims from entering. The hate for western culture was inevitable, whether external or internal. They have every right to hate what america is, but none-the-less they are a threat to everyones' city. Stopping the influx of migrants may have a 0.1 chance that one is a extremist.