If 1 billion people from other countries want to come to the USA tomorrow. Should they be allowed?

If they can get here, sure.

I don't think it's logistically possible for 1 billion people to migrate in a day.

That sounds like an awful lot of people who will want to buy food, houses, televisions, mobile phones, automobiles, ziploc bags, photocopiers, vinyl siding, and so on.

Where would we find the people to build all those things, and do all that work? Why, we’d need like 1 billion more people to do all that!

And what would that do to our GDP? Multiply it by 4 or 5? How horrible!