U.S. Border Agents Pursue Human And Drug Smugglers Near Mexican Border [Getty Images]

MCALLEN, TX - AUGUST 18: Texas State Troopers patrol the Rio Grande at the U.S.-Mexico border on August 18, 2016 near McAllen, Texas. Securing the U.S.-Mexico border has become a major issue in the U.S. Presidential campaign. (Photo by John Moore/Getty Images)

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