One of the issues is that our existing Asylum Program is being raped hard.
In theory, I don't have a problem with the idea that folks that are in truly dire straights in other countries could apply for, and receive refuge in the US. In practice, there's a number of problems with the program including the length of time that it takes to get approval to travel out of somewhere supposedlly dangerous, to the US's inability to decide amongst ourselves how many refugees we'd care to shelter.
On top of that, the current administration is using that frame work to allow anyone that shows up at the border from anywhere slightly poorer or more dangerous than the US to enter the Asylum system, regardless of the actual state of the people at home. Hence the economic migrants seeking "asylum". But everyone that says the magic words gets a hearing.
From 1991 to 2021 The US
admitted 797,950 asylum seekers and it can be assumed that the system is set up to handle that flow with the normal fed.gov efficiency. Which is to say, not very well, but not a crisis. By
May of 2023 1.3 million asylum applications waited the 700 or so judges that do this. There are slightly more than double the number of applications processed in 20 years currently waiting to be looked at. By that standard 7 years out is looking pretty decent actually.
I'm not making excuses for the politicians whose cynical grab for more voters, bleeding hearts, or incompetency got us here, and Congress needs to put on it's adult pants and actually overhaul immigration policy, while making sure that the Executive actually starts enforcing laws. But even if we magically dropped a forcefield over the border today, we have a decade of processes and applications to wade through for approval or denial and subsequent deportation. In the meantime these folks, not all of whom are locust like invaders, will be living here, getting jobs, building businesses, paying taxes, marrying and having kids, etc. Joe Biden, in the last three years, has bought us an actual Humanitarian Crisis out of the one the Dems fabricated with staged pictures at empty fences.