If legal authority or lack thereof is not the issue then the details matter if we're going to make an issue of this. I suspect that the researcher's private communications should not have caused them to be denied entry, though to be certain we'd have to see them.

Would a researcher who said something like "J6 should have gone all the way" have been denied entry in 2021? I suspect they would have, and that many would have cheered that refusal.

>Would a researcher who said something like "J6 should have gone all the way" have been denied entry in 2021? I suspect they would have, and that many would have cheered that refusal.

On what basis do you have for this belief? Frankly, I think that's facially ridiculous.

Because lots of foreigners have been denied entry to the U.S. for lots of reasons like this in the past.

Sorry I have not heard of a single instance where a foreigner was denied entry into the US because of their beliefs about January 6, I think you're going to need to support an assertion like that when you say it has happened "lots"