U.S. troops at the southern border started detaining migrants last week as part of the “Deep South Campaign” to prosecute individuals found trespassing in National Defense Areas (NDAs).

President Trump has currently designated the U.S.-Mexico stretches between El Paso to Fort Hancock, Texas, as an NDA alongside the land line marking the country’s boundaries in New Mexico.

U.S. Army Lt. Col. Chad Campbell said three individuals were among the first detained near Santa Teresa, N.M., last week. They now remain in the custody of U.S. Customs and........

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