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.
... did you think that's what I was implying? I'm not even American my guy. I was adding clarification because the commenter I responded to claimed they had to be a US citizen to ride.