Read MoreIn 2015, then-candidate Donald Trump campaigned on a promise to build a wall spanning the entire southern border with Mexico. Mireya Villarreal rode along with Border Patrol to see how those plans developed.In 2015, then-candidate Donald Trump campaigned on a promise to build a wall spanning the entire southern border with Mexico. Mireya Villarreal rode along with Border Patrol to see how those plans developed.
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