half way decent overview here - before the current brouhaha. Note the differences between “accompanied” and unaccompanied” minors.
https://www.humanrightsfirst.org/resource/flores-settlement-brief-history-and-next-steps
there is a link to a PDF (Download PDF Here) with additional info.
Under: “Current Litigation” take note of the provisions and additional filings all take place under Obama.
None of this is about policy - it's all about politics.
I think Pres. Trump has just put the Rats in a trick bag.
Thanks for that...ask me tomorrow to explain it all. I volunteer to write a precis’ for the group.