John BurnettJohn Burnett is the Southwest Correspondent on the National Desk.
Nora Isabel Gallegos, left, stands with her daughter Priscila Arévalo in the riverside park in Nuevo Laredo, Mexico, where her husband Guillermo was killed by the Border Patrol seven years ago.
A special response team with Customs and Border Protection drills on the international bridge between Laredo, Texas, and Nuevo Laredo, Mexico, in the event that desperate migrants rush the port of entry.
The Pew Research Center estimates there are 7.5 million unauthorized workers in the United States concentrated in agriculture, construction and the hospitality industry.
Karina Perez for NPR