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A motorcade carrying U.S. President Donald Trump drives past a U.S.-Mexico border fence as he heads for an inspection of border wall prototypes in San Diego, Calif., on March 13, 2018. (Mandel Ngan/AFP via Getty Images)
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US President Donald Trump inspects border wall prototypes in San Diego, California on March 13, 2018. (Mandel Ngan/AFP via Getty Images)
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President Donald Trump makes his first trip to California as president. The state is the most populous in the country and a Democratic stronghold. (Mandel Ngan/AFP via Getty Images)
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The president has warned there would be "bedlam" without the controversial wall he wants to build on the border with Mexico. (Mandel Ngan/AFP via Getty Images)
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Supporters of President Donald Trump display signs during a rally attended by about 500 people in San Diego, Calif., on March 13, 2018, where he was visiting the nearby border wall protoypes. (Bill Wechter/AFP via Getty Images)
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Demonstrators place a banner reading "Trump stop massive deportations," during a protest against U.S. President Donald Trump's migration policies on the Mexican side of the U.S.-Mexico border in Tijuana. (Guillermo Arias/AFP via Getty Images)
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The president's trip to the Golden State was largely upstaged by his own announcement that he had sacked Secretary of State Rex Tillerson. (Mandel Ngan/AFP via Getty Images)
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U.S. President Donald Trump holds up a poster of before and after photos of a segment of the border wall prototypes with Chief Patrol Agent Rodney S. Scott, right, in San Diego, Calif., on March 13, 2018. (Mandel Ngan/AFP via Getty Images)
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U.S. President Donald Trump inspects U.S.-Mexico border wall prototypes in San Diego, Calif., on March 13, 2018. (Mandel Ngan/AFP via Getty Images)
U.S. President Donald Trump tweeted a video following his visit to San Diego, California, saying that without a wall, “we’re not going to have a country.”
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Border wall models thwart US commandos in tests
Identifying strengths and flaws of each design could lead to a Lego design, pulling pieces from different prototypes.
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