Trumps border wall prototypes

US Customs and Border Protection selected six companies to construct the prototypes, which the agency said are meant to "inform future design standards" for the wall.

Although Trump's plans for a border wall have been beset by a number of obstacles - including the Senate's refusal to green light a $1.6 billion down payment, wavering estimates on the total cost, and a lawsuit from California - his administration has plowed ahead with the prototypes.