There's neither even a rhyme nor reason to Trump's fascism (or to fascism in general). But it does correlate with the observation that they are fantasists. They do things out of whim and emotions, disregarding expert advice and opinions. Any promulgation of fascism will eventually lead to its own downfall, because they live in a fantasy world where they believe that their will alone could shape reality; ignoring the basic common sense that reality could never be altered to one's desires.

Basically like firing you from work for discrimination isn't legal, but firing you for performance is (your performance being anything they wish to come up with).

It has been ruled by SCOTUS that the Constitution specifically does not apply at border entry to non-citizens:

https://en.wikipedia.org/wiki/United_States_ex_rel._Knauff_v._Shaughnessy

the Constitution does not grant aliens any protections when trying to enter the United States.

https://constitution.congress.gov/browse/essay/artI-S8-C18-8-7-3/ALDE_00001263/['article',%20'14']

an alien "on the threshold of initial entry stands on a different footing" because he or she is theoretically outside the United States and typically beyond the veil of constitutional protection.

https://supreme.justia.com/cases/federal/us/345/206/

Although a lawfully resident alien may not captiously be deprived of his constitutional rights [to due process], the alien in this case is an entrant alien or "assimilated to that status" for constitutional purposes.

The Attorney General therefore may exclude this alien without a hearing, as authorized by the emergency regulations promulgated pursuant to the Passport Act, and need not disclose the evidence upon which that determination rests.

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

It's against American law.