If most of the 10,000 illegal aliens in the caravan-army benefit from “catch-and-release” into the U. S., why wouldn’t millions of others think the way is clear for them? So considering Mexico has no interest in helping prevent the flow of migrants northward into the U. S., president Trump should use some troops on the border who of course who wouldn’t apprehend all illegal aliens, but who would let those to the south know the U. S. is serious about securing her borders, in the hope that Mexico will realize the U. S. is serious and accept those apprehended when received by Mexico upon the migrants return there).