Folks from the “caravan” have begun arriving in the Mexican border town of Tijuana preparatory to their effort to enter the US and ask for asylum.
These folks, claiming to flee government persecution and/or criminal assaults (which isn’t an asylum criterion, anyway), in their home countries, succeeded in escaping those things when they succeeded in entering Mexico—especially with Mexico having offered them asylum (and job opportunities) after that entry.
Now they need to say what they fear about their Mexican hosts that drives their need to flee Mexico and get asylum in the US. Since they haven’t experienced any of that in Mexico, and they have rejected Mexican asylum from their home countries, they should be denied entry into the US and those that do make it in need to be denied asylum here—their requests can only be shams.