Different supreme court

Sure, but I would honestly be surprised if even this conservative supreme court overturned that precedent, because it was grounded in first amendment protections, which applies to everyone on American soil and to border control agencies evaluating visas.

kids and cages thing

I'm pretty sure that existed before Obama, but given the state of search engines these days, I don't know if I'm going to be able to find something about it. All Trump did here was revoke some of Obama's EOs, he didn't really change any of the laws, so that nonsense was likely legal and commonplace.

The proper solution here is to pass laws, not EOs, yet nobody seems interested in doing that. And that's a big reason I'm very disappointed in both parties right now, immigration is a major concern of mine (I want more, and the process should be easier), but neither party seems interested in actually solving any problems with it, they just pass some EOs to make it a little better or a little worse.