Originally Posted by
GUWonder
The US visa waiver program is not applicable to most (or is it now all?) citizens of the blacklisted countries. Re-entry from neighboring countries does require a lot of non-Canadians and non-VWP countries' citizens to have a valid US visa to travel to/enter the US.
Wrong, and it's even on the CBP website:
https://help.cbp.gov/app/answers/det...T1FrVl9QOW4%3D
Admittedly some of the currently banned countries aren't eligble for automatic revalidation, but far from all of them.
(Moreover I've seen documentation stating that travel validation signatures aren't required for travel to contiguous territories on J-1/F-1, which is what is more relevant in this case- but I can't find that online currently.)