Then how do we enforce our immigration laws?
We could start by
actually enforcing our own asylum and human rights laws for one, as I've been saying for awhile. If we are going to lay out a path for people to apply for asylum, that requires them to come here in person and turn themselves in in order to apply, then we need to honor that instead of immediately arresting them and throwing them in cages--the overwhelming majority of people in these "detention facilities" are asylum seekers. And when we instead effectively kidnap them and toss them in these camps then we can't be surprised that, after they've made this journey, they no longer feel safe doing so and instead cross the border illegally. The way the laws are being "enforced" is nothing different than luring animals into a trap, which is probably how Trump gleefully sees this whole situation as he's made clear that's how he sees them. If we do not wish to allow asylum seekers, then we need to either allow them to apply in their home countries (which is currently not permitted) or end the program entirely, so they aren't traveling thousands of miles into a trap.
Nowhere in our immigration laws does it say people who enter illegally (or follow the legal process for asylum seeking) are to be separated from their families, locked in cages, starved, etc so again having these camps in themselves are in violation of our own laws.