Man 'refused entry into US' as border control catch him with bald JD Vance meme
(www.dailystar.co.uk)
They have "deported" dozens of US citizens at this point. Usually, being a non-citizen makes you more vulnerable to arbitrary bullshit at the border, whereas if you're a citizen you can stand up much more so for your rights if they're trying to push you into something illegal, but as of this year it's starting to matter less and less.
Everything is actionable once the rule of law collapses. At this point, if you're crossing the border, you're in danger of whatever they want to do to you.