The 56% drop in illegal border crossings since a peak in May is being credited in large part to efforts in Central America, especially Mexico, to team up with the Trump administration to curb the flow of migrants.

“That international effort is making an impact. Mexican operational interdiction is certainly highlight of that effort, but the shared responsibility we’re seeing in the region, governments stepping up and saying we also own this,” said Homeland Security Kevin McAleenan in a small briefing for reporters.