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A Tempe company was one of four firms named Thursday to build the first prototypes of President Donald Trump's proposed border wall with Mexico, Customs and Border Patrol officials announced. More prototypes will be announced next week in the "other materials" section of the request for proposals.

A gap in the existing border wall near Jacumba in East San Diego County.

The four companies that were awarded contracts are: Caddell Construction Co., Fisher Sand & Gravel Co., Texas Sterling Construction Co. and W. G. Yates & Sons Construction Company. Congress has not yet authorized any further money to actually build new miles of wall, though Trump has issued a threat to shut down the government if they don't do so this year.

Trump has said he wants the new border wall to be transparent so people can avoid being hit with "large sacks of drugs" being thrown over the barrier. Last month, the Trump administration said, according to two government sources, that it will not conduct an environmental review of the impact the wall will have on Santa Ana. The four contacts are each worth between $400,000 and $500,000. Or are they not used to politicians doing hat they say they are going to do?

He attacked the media in January, two weeks before he took office, for failing to report Mexico's alleged commitment to funding the wall.

The same poll appeared to suggest that support for President Trump was also declining, with 56 per cent of voters believing that the president was "tearing the country apart", compared to 33 per cent who said he was pulling the country together.

But with less than 2 percent of the USA population living within 40 miles of the Mexico border, most of the electricity generated by the wall would be useless - without the construction of costly transmission lines to channel the electricity to other parts of the country.

According to The New York Times, "The companies selected will each have 30 days to complete the projects after the agency gives them the order to proceed".

The deputy commissioner of CBP, Ronald Vitiello, said this work would help to refine the eventual construction programme.

Chief Vitiello said the concrete wall isn't appropriate for right along the border but will be tested as secondary fence instead.