No. NAFTA Didn't Kill American Manufacturing Employment: Afterthoughts 5

Should-Read: David Anderson: Trump and the Global Creative Class: "Amitabh Chandra: 'Immigration ban and the fear they create is a giant tax on US universities and US innovation... research and R&D will move abroad'...

...We’re much less attractive as a country to very smart, mobile international students and researchers this week than we were last week. And I bet that we’ll be less attractive next week than this week. Think about the incentive for a twenty something looking to do a post-doc? They could come here and work with an awesome group but when they need to travel to a conference overseas they might not be allowed back into the country? Or they could go to Canada or Japan or Australia or the EU where they don’t have that new worry as a cost to their calculus of choice.

Will this stop all international brain drain that the US massively benefits from? No, but it will impede it.