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In this June 13, 2013 picture, U.S. Border Patrol agent Jerry Conlin looks to the north near where the border wall ends as is separates Tijuana, Mexico, left, and San Diego, right. Illegal immigration into the United States would decrease by only 25 percent under a far-reaching Senate immigration bill, according to an analysis by the Congressional Budget Office that also finds the measure reduces federal deficits by billions. (AP Photo/Gregory Bull)