Trump’s Draconian Border Lockdown Has a New Target

For the past year, the bridges that cross from Ciudad Juárez to El Paso have been surrounded by encampments of Central Americans waiting to apply for asylum in the United States. As the Trump administration clamped down even further on asylum over the summer and threatened Mexico with tariffs if it didn’t stop more Guatemalans, Hondurans, and Salvadorans from reaching the US border, those camps started to shrink—until recently, when the makeshift shelters began to be occupied by a new group of would-be asylees: Mexicans.

On a recent afternoon...