Anything you require of people traveling to the US, can and will be required of US citizens traveling abroad. Tit for tat is a very real thing.<p>So, ask yourself just how badly you want Americans treated abroad (including diplomats), and make sure you don’t treat any travelers to the US any worse than that.
> CBP proposes to require mug shots of all non-US citizen travelers<p>Perhaps CBP could just get non-citizens to preemptively serve jail time, for the unmitigated gall of being a non-citizen.