Environmental advocates warn that border wall construction on the rugged mountain could cause erosion and sever wildlife corridors. Customs and Border Protection says it is necessary to prevent border crossings.By Martha PskowskiEL PASO—U.S. Customs and Border Protection plans to build a 1.3-mile border barrier on Mount Cristo Rey, an iconic mountain rising above the Rio Grande and the neighboring cities of Juárez and El Paso.

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