FILE - In this June 13, 2013 file photo, Daniel Zambrano, of Tijuana, Mexico, holds one of the bars that make up the border wall separating the U.S. and Mexico where the border meets the Pacific Ocean in San Diego. Presumptive GOP nominee Donald Trump's push for a border wall is not a new idea, and since World War I, has been pursued often. Historians say opponents of Mexican immigration have advocated for a wall off and on for about 100 years with little results due to changing technologies and pressure to divert enforcement attention elsewhere. (AP Photo/Gregory Bull, File)
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