FILE--In this April 14, 2016, file photo provided by U.S. Customs and Border Protection, a Border Patrol agent shows the path of a tunnel that crosses the U.S.-Mexico border near Calexico, Calif. The federal government has started work on a border wall in California to replace a decades-old decaying barrier. SWF Constructors, a tiny Nebraska startup, was awarded the first border wall construction project under President Donald Trump. It is the offshoot of a construction firm that was accused in a government audit of shady billing practices. (U.S. Customs and Border Protection via AP, file)
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