Suppose I have tickets, hotel reservations, and a visa to visit the United States.
Suppose I've previously been to Iran for a conference, and/or have an Iraqi passport.
Here's the risk I'm concerned about: Suppose that between the time I pay for everything and the time I enter the United States, its President issues an Executive Order declaring that I will not be allowed in (or that as a result of new policy, I will be detained for long enough to miss a connection), based on my membership in some set (examples above). That happened to a lot of people earlier this year. Although a court has temporarily blocked that claiming it seems like it might be based on religious discrimination, the President is fighting to restore travel bans and could issue new, broader orders at any time [or the previous ones could be restored to immediate action by a court victory].
Is this the kind of thing that standard travel insurance will cover? I'm talking about the kind you get in the checkout process when buying the airplane tickets etc. on popular websites, but if those plans don't cover it and ones purchased separately do, that would be useful to know as well.
I'm not looking for recommendations asserting that one particular policy is the best or worst, and there are other factors that would come into play for recommendations but which are out of scope for this question about how the coverage generally works with respect to this one specific risk.
If this site has travelers who bought insurance and got stuck earlier this year (either stuck in transit or had to stay home), I'd especially like to hear your experiences on this.