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TIJUANA, MEXICO - OCTOBER 5:  Prototype sections of a border wall between Mexico and the United States are under construction on October 5, 2017 in Tijuana, Mexico. Prototypes of the border wall propopsed by President Donald Trump are being built just north of the U.S.- Mexico border, where competitors who are hoping to gain approval to build the wall have until the first of next month to complete their work. (Photo by Sandy Huffaker/Getty Images)
TIJUANA, MEXICO - OCTOBER 5:  Prototype sections of a border wall between Mexico and the United States are under construction on October 5, 2017 in Tijuana, Mexico. Prototypes of the border wall propopsed by President Donald Trump are being built just north of the U.S.- Mexico border, where competitors who are hoping to gain approval to build the wall have until the first of next month to complete their work. (Photo by Sandy Huffaker/Getty Images)

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    Watch Trump's border wall prototypes being built

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Watch Trump's border wall prototypes being built

President Donald Trump promised to build a wall on the U.S.-Mexico border. Six companies have been selected to build eight prototypes of the wall.

Watch Trump's border wall prototypes being built

President Donald Trump promised to build a wall on the U.S.-Mexico border. Six companies have been selected to build eight prototypes of the wall.