“Remain-in-Mexico” has proven controversial with human rights and pro-migrant activists, who claim it can place migrants in significant danger of kidnapping or violence by returning them to the Mexican side of the border.  The program is facing a legal challenge at the Ninth Circuit Court of Appeals. A ruling is expected soon.

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That regional cooperation has also produced agreements with Guatemala, El Salvador, and Honduras. The agreement with Guatemala sees migrants flown into that country to claim asylum there. Acting DHS Secretary Chad Wolf on Friday said that so far 96 migrants have been flown into Guatemala, but that only one individual eventually chose to claim asylum.

Those agreements have fueled a dramatic drop in apprehensions at the border by more than 70 percent since May. In December, law enforcement apprehended or turned away 40,620 at the border, the seventh month of decline since the more than 144,000 encountered in May.