Word about how to game the system has spread, and now migrants are coming through the southern border from as far as Angola and the Congo.

One Texas resident asked why “non-border states” can’t “help support” the immigrants with free emergency-room services, schooling and other costly benefits.

Truth is, towns across the US ­already doing that are strained by the costs. Trump’s Remain-in-Mexico program is designed to alleviate that problem. The more asylum-seekers Mexico shelters, the more money stays in taxpayers’ pockets.

So far only a few hundred have been returned to Mexico. Litigation stalled the effort.