President TrumpDonald TrumpWhat blue wave? A close look at Texas today tells of a different story Democrats go down to the wire with Manchin Trump's former bodyguard investigated in NY prosectors' probe: report MORE’s border wall prototypes set up on the San Diego-Tijuana border will be dismantled to make space for construction on a secondary barrier, officials said Saturday.

A Customs and Border Protection (CBP) spokesperson told The San Diego Union-Tribune that construction crews have already substituted most of an old secondary layer of fencing along 14 miles of the border and commenced construction on the new barrier in recent days.

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CBP and the Department of Homeland Security did not immediately respond to requests for comment from The Hill.

The eight prototypes lie between the end of the old secondary fence and the construction site for the new barrier, where construction crews have begun planting the first panels of concrete-filled steel posts placed in close proximity to each other.

“That’s always been the plan,” the CBP spokesman said. “They just don’t serve a purpose anymore.”

The prototypes cost between $300,000 and $500,000 each and taught border agents a lot about effective barriers, the spokesman added.

Construction on the replacement barrier is expected to run until early 2020.

Trump visited the mock-ups in March to tout the progress on the border wall, saying they were "fantastic" and that migrants would be unable to climb over them.