These days, Martin Salgado’s migrant shelter in the city of San Luis Rio Colorado on Mexico’s border with the United States feels more like an hourly hotel. Salgado said he has never seen people cycle through as repeatedly as he has in recent months, after the United States began expelling almost all migrants caught on the Mexican border rather than returning them to their homelands. Now, human smugglers often attempt to get migrants back across the border the very same day they are deported, he said.