The first set of contracts to build the Mexico border wall have been handed out.
Four companies have received contracts worth an estimated total of $500,000 (£387,000) to build prototypes for the planned construction along the US-Mexico border.
The announcement was made by the US Customs and Border Protection office (CBP), saying the models will be built in the coming months.
The concrete prototypes will be around 30ft long (9m) and around 30ft tall, and officials are to spend roughly two months testing them for tampering and resistance to penetrating hand tools.
The deputy commissioner of CBP, Ronald Vitiello, said this work would help to refine the eventual construction programme.
The construction of a wall along the border to Mexico had been a cornerstone promise of Donald Trump's presidential campaign.
The four companies to be awarded the contracts are Caddell Construction in Alabama, Texas Sterling Construction in Texas, WG Yates & Sons Construction in Mississippi, and Fisher Industries in Arizona.