Well we are pretty sure who will be put in the front of the horde right?
I’ve been thinking about that.
I suspect that a couple of F-16 making a low level supersonic run along the border, followed by a C-130 making a flare angel (https://www.youtube.com/watch?v=3mIEIZ2x1JE), will cause the women and children to break and run to the rear.
Some water cannon loaded with skunk water (https://en.wikipedia.org/wiki/Skunk_(weapon)) will take care of the rest.
Of course, we can always just let them in and have them move through a Disneyland style line. You know, the kind that keeps winding forever and is designed to not let you see that you have another 4 or 5 huge rooms to wait in. And after you are done and get to the front you realize that the bus you are getting on is heading back to Honduras.