This is a desperate attempt to soothe terrified people that will only create more terrified people as well as suspicion and prejudice. There's not currently a problem that's been seen with our system as it is and this has the potential to severely harm tourism and good people, possibly even American citizens! Why don't we find real solutions to the problem of terrorism and not just superficial band aids that really only satisfy the frantic fears of people who have no idea of what's really going on with terrorism. (It's not all ISIS and coming in from abroad!)