Man 'refused entry into US' as border control catch him with bald JD Vance meme
(www.dailystar.co.uk)
You have even less rights at border crossings if you are not a citizen and have not technically entered the country through immigration yet... basically the Constitution does not even apply:
https://en.wikipedia.org/wiki/United_States_ex_rel._Knauff_v._Shaughnessy