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U.S. Customs and Border Protection is asking for design proposals and prototypes of President Trump's proposed wall on the U.S.-Mexico border.
Late Friday, the agency released specifics for the first time on how tough the barrier must be. CBP posted online two different options for contractors: one proposal must be for a solid concrete wall, another is for a wall with "a see-through component/capability" that is "operationally advantageous."
"The wall design shall be physically imposing in height," the CBP outlines say. The government says its "nominal concept" is for a 30-foot-high wall, but adds that designs as low as 18 feet "may be acceptable."
More than 400 companies have told the Department of Homeland Security they're interested in the project, NPR's Richard Gonzales reported last week. Cost estimates of the wall vary widely: President Trump said it would cost $12 billion; an MIT study said $38 billion.
The deadline for contractors to submit their proposals for the first phase is March 29.