Let me make sure I've got this straight.
You're arguing that we should stop letting anyone into the country, whether it's for business or tourism or any other reason.
You must be aware that a move like that would instantly cause an apocalyptic economic depression throughout the country, right?
NO, I'm not aware of that, and I don't think you are either. Whatever business Americans need to conduct they can do it internationally on line through emails, webcams, etc. The US economy doesn't depend on tourism, and we never need foreign students, and we sure don't need more immigrants to pillage our economy for $130 Billion/year in remittances$$$ are they do now.