The Department of Homeland Security has said the wall should cost $21 billion, though others have said it would cost much mores - especially since Trump has said an actual wall - and not a fence - will be built. That list is to be whittled down in ten days, with the finalists notified on March 20.
Trump said during the campaign that the wall would be a literal barrier, though some of his surrogates have suggested some parts of the border might benefit more from electronic and other means of surveillance.
"We will soon begin the construction of a great wall along our southern border".
"The primary goal of this effort is to develop design standards for a border wall that may be constructed along the southwest border with Mexico in support of [U.S. border protection] operational requirements", Carlos Diaz, spokesman for the CBP, told The Daily Caller News Foundation Tuesday.
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Some of the possible general contractors mentioned as prospective bidders include Granite Construction Inc. He has assured Americans that Mexico would pay for the wall - a claim denied repeatedly by Mexico's elected leaders - and the issue has soured relations between the two countries.
For every Mexican peso provided by migrant workers, Mexico's federal, state and municipal governments contribute an additional peso in what's known as the "3×1" program.
"They will reimburse us for the cost of the wall".
Trump said the nation wanted "all Americans to succeed" but it could not happen "in an environment of lawless chaos". Mexico collected $27 billion in remittances in 2016 so even a fraction of that could easily fund a border wall that would likely take years to build.