Also, note, everyone assumed it was going to be limited to citizens, but that's not what the government said. They put it under ITAR/EAR's US person definition which includes citizens, permanent residents, refugees and asylees. Basically only visa holders in the US were banned, and of course, people in foreign countries.

https://www.ecfr.gov/current/title-15/part-772/section-772.1...