America has always been considered a country of immigrants. If you stop the flow of immigrants could lead to the fact that many firms will lose the opportunity to hire the best employees in the world. It may have a negative impact on the U.S. economy.
Actually, the ban is affecting non-Muslims as well. Some of my relatives (Bhutanese refugees) were supposed to get their visas by this February. But due to the immigration ban, they haven't yet got them. None of them are Muslims. They are all Hindu. I don't know why the authorities are denying them visa.