In this July 12, 2014 file photo, a young boy is helped down from a freight car as Central American migrants board a northbound freight train in Ixtepec, Mexico, and head to Colorado.
In this July 12, 2014 file photo, a young boy is helped down from a freight car as Central American migrants board a northbound freight train in Ixtepec, Mexico, and head to Colorado. Eduardo Verdugo The Associated Press
In this July 12, 2014 file photo, a young boy is helped down from a freight car as Central American migrants board a northbound freight train in Ixtepec, Mexico, and head to Colorado. Eduardo Verdugo The Associated Press