A section of the border fence is shown, Thursday, Feb. 16, 2017, along the U.S.-Mexico border in Brownsville, Texas. The United States does not have a way to measure how well fencing works to deter illegal crossings from Mexico, according to a report released Thursday by Congress' main watchdog as President Donald Trump renewed his pledge to build "a great wall" on the border. (Jason Hoekema/The Brownsville Herald via AP)
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