Test of steel border wall prototype showed it could be sawed through

President Donald Trump has repeatedly advocated for a steel slat design for his border wall, which he described as "absolutely critical to border security" in his Oval Office address to the nation Tuesday. But Department of Homeland Security testing of a steel slat prototype proved it could be cut through with a saw, according to a report by DHS.

A photo exclusively obtained by NBC News shows the results of the test after military and Border Patrol personnel were instructed to attempt to destroy the barriers with common tools.

The Trump administration directed the construction of eight steel and concrete prototype walls that were built in Otay Mesa, California, just across the border from Tijuana, Mexico. Trump inspected the prototypes in March 2018. He has now settled on a steel slat, or steel bollard, design for the proposed border barrier additions. Steel bollard fencing has been used under previous administrations.

In a statement, DHS Spokeswoman Katie Waldman said, "The steel bollard construction is based on the operational requirements of the United States Border Patrol and is a design that has been honed over more than a decade of use. It is an important part of Border Patrol's impedance and denial capability."

"While the design currently being constructed was informed by what we learned in the prototypes, it does not replicate those designs," said Waldman. "The steel bollard design is internally reinforced with materials that require time and multiple industrial tools to breach, thereby providing U.S. Border Patrol agents additional response time to affect a successful law enforcement resolution. In the event that one of the steel bollards becomes damaged, it is quick and cost-effective to repair.

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