In test, steel prototype for border wall was cut through with saw

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 experts from the Marine Corps 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.

However, testing by DHS in late 2017 showed all eight prototypes, including the steel slats, were vulnerable to breaching, according to an internal February 2018 U.S. Customs and Border Protection report.

Photos of the breaches were not included in a redacted version of the CBP report, which was first obtained in a Freedom of Information Act Request by San Diego public radio station KPBS.

The photo of testing results obtained by NBC News was taken at the testing location along the California-Mexico border, known as "Pogo Row."

Photo: NBC News

NBC News toured the eight wall prototypes twice before President Trump's March 2018 inspection. According to San Diego Sector Border Patrol Chief Rodney Scott, the versions seen by NBC News and the president, however, were larger than the actual prototypes tested at "Pogo Row."

DHS did not respond to a request for comment.

In response to KPBS, CBP spokesman Ralph DeSio said the prototypes "were not and cannot be designed to be indestructible," but were designed to "impede or deny efforts to scale, breach, or dig under such a barrier, giving agents time to respond."

In his address to the nation Tuesday, Trump said the steel fence design is "what our professionals at the border want and need. This is just common sense."

19 PHOTOS
Migrants in Tijuana trickling over and under the border wall
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Migrants in Tijuana trickling over and under the border wall
Honduran migrant Joel Mendez, 22, passes his eight-month-old son Daniel through a hole under the U.S. border wall to his partner, Yesenia Martinez, 24, who had already crossed in Tijuana, Mexico, Friday, Dec. 7, 2018. Moments later Martinez surrendered to waiting border guards while Mendez stayed behind in Tijuana to work, saying he feared he'd be deported if he crossed. (AP Photo/Rebecca Blackwell)
Central American migrants planning to surrender to U.S. border patrol agents climb over the U.S. border wall from Playas de Tijuana, Mexico, late Monday, Dec. 3, 2018. Thousands of migrants are living in crowded tent cities in the Mexican city of Tijuana after undertaking a grueling, weeks-long journey to the U.S. border. (AP Photo/Rebecca Blackwell)
In a photo taken from Playas of Tijuana, Mexico, Honduran migrants climb over a section of the U.S. border fence before handing themselves in to border control agents, Sunday, Dec. 2, 2018. A steady trickle of Central American migrants have been finding ways to climb over, tunnel under or slip through the U.S. border wall to plant their feet on U.S. soil and ask for asylum. (AP Photo/Rebecca Blackwell)
Honduran migrants who jumped the border wall to the U.S. side, help other members of their families to jump the wall, in Tijuana, Mexico, Sunday, Dec. 2, 2018. Thousands of migrants who traveled via caravan are seeking asylum in the United States, but face a decision between waiting months or crossing illegally, because the U.S. government only processes a limited number of cases a day at the San Ysidro border crossing in San Diego. (AP Photo/Ramon Espinosa)
Honduran migrant Joel Mendez, 22, feeds his eight-month-old son Daniel as his partner Yesenia Martinez, 24, crawls through a hole under the U.S. border wall, in Tijuana, Mexico, Friday, Dec. 7, 2018. Moments later Martinez surrendered to waiting border guards while Mendez stayed behind in Tijuana to work, saying he feared he'd be deported if he crossed. (AP Photo/Rebecca Blackwell)
Yesenia Martinez, 24, carries her eight-month-old son Daniel as she looks for a place to cross the U.S. border wall to surrender to border patrol and request asylum, in Tijuana, Mexico, Friday, Dec. 7, 2018. Martinez surrendered to waiting border guards while her partner Joel Mendez stayed behind in Tijuana to work, saying he feared he'd be deported if he crossed. (AP Photo/Rebecca Blackwell)
A woman climbs the U.S. border wall, planning to surrender to U.S. Border Patrol agents and apply for asylum, as she crosses from Playas de Tijuana, Mexico, Monday, Dec. 3, 2018. Often within minutes, border guards quickly arrive to escort migrants to detention centers and begin "credible fear" interviews. (AP Photo/Rebecca Blackwell)
A woman holding a baby peers through the U.S. border fence as she tries to reach a point where scores of migrants have been crossing in recent days, now blocked by private security, in Playas de Tijuana, Mexico, Wednesday, Dec. 5, 2018. Legal groups argue that federal law states that immigrants can apply for asylum no matter how they enter U.S. territory. (AP Photo/Rebecca Blackwell)
Honduran migrant Leivi Ortega, 22, wearing a rosary, looks at her phone while she, her partner and their young daughter, wait in hopes of finding an opportunity to cross the U.S. border from Playas de Tijuana, Mexico, Wednesday, Dec. 5, 2018. In early December, U.S. Customs and Border Protection said that the San Diego sector experienced a "slight uptick" in families entering the U.S. illegally with the goal of seeking asylum. (AP Photo/Rebecca Blackwell)
Yesenia Martinez, 24, reaches back from the San Diego, California side of the U.S. border wall to get her baby's bottle, after crossing underneath from Tijuana, Mexico, Friday, Dec. 7, 2018. Martinez is among a wave of Central Americans getting past the imposing barrier between Mexico and California and expediting their asylum claims by readily handing themselves over to U.S. agents. (AP Photo/Rebecca Blackwell)
A Honduran migrant helps a young girl cross to the American side of the border wall, in Tijuana, Mexico, Sunday, Dec. 2, 2018. In November, President Donald Trump issued a proclamation suspending asylum rights for people who try to cross into the U.S. illegally from Mexico, although a divided U.S. appeals court has refused to immediately allow the Trump administration to enforce the ban. (AP Photo/Ramon Espinosa)
Salvadoran migrant Cesar Jobet, right, and Daniel Jeremias Cruz hide from U.S. border agents after they dug a hole in the sand under the border wall and crossed over to the U.S. side, in Playas de Tijuana, Mexico, Friday, Nov. 30, 2018. When the two youths were detected by agents they ran back to the Mexican side. (AP Photo/Ramon Espinosa)
A Honduran migrant walks with his son in his arms after jumping the U.S. border wall with plans to turn himself over to U.S. border patrol agents in order to apply for asylum, seen from Tijuana, Mexico, Thursday, Nov. 29, 2018. In twos or threes, or sometimes by the dozen, migrants arrive at the U.S. border wall and manage to cross over. (AP Photo/Ramon Espinosa)
A Honduran migrant walks with his son in his arms after jumping the wall to the U.S that separates Tijuana, Mexico and San Diego, in Tijuana, Mexico, Thursday, Nov. 29, 2018. Aid workers and humanitarian organizations expressed concerns Thursday about the unsanitary conditions at the sports complex in Tijuana where more than 6,000 Central American migrants are packed into a space adequate for half that many people and where lice infestations and respiratory infections are rampant. (AP Photo/Ramon Espinosa)
A Honduran migrant walks with his son in his arms after jumping the wall to the U.S that separates Tijuana, Mexico and San Diego, in Tijuana, Mexico, Thursday, Nov. 29, 2018. Aid workers and humanitarian organizations expressed concerns Thursday about the unsanitary conditions at the sports complex in Tijuana where more than 6,000 Central American migrants are packed into a space adequate for half that many people and where lice infestations and respiratory infections are rampant. (AP Photo/Ramon Espinosa)
A Honduran migrant walks after jumping the wall to the U.S that separates Tijuana, Mexico and San Diego, in Tijuana, Mexico, Thursday, Nov. 29, 2018. Aid workers and humanitarian organizations expressed concerns Thursday about the unsanitary conditions at the sports complex in Tijuana where more than 6,000 Central American migrants are packed into a space adequate for half that many people and where lice infestations and respiratory infections are rampant. (AP Photo/Ramon Espinosa)
In a photo taken from the Tijuana, Mexico, side of the border wall, a guard on the U.S. side, at left, watches Honduran migrants jump the wall into the United States, Sunday, Dec. 2, 2018. Thousands of migrants who traveled via caravan are seeking asylum in the U.S., but face a decision between waiting months or crossing illegally, because the U.S. government only processes a limited number of cases a day at the San Ysidro border crossing in San Diego. (AP Photo/Ramon Espinosa)
In a photo taken from the Tijuana, Mexico, side of the border, two immigrants on U.S. soil try to jump the second wall before border police arrived and arrested them, Sunday, Dec. 2, 2018. Thousands of migrants who traveled via caravan are seeking asylum in the U.S., but face a decision between waiting months or crossing illegally, because the U.S. government only processes a limited number of cases a day at the San Ysidro border crossing in San Diego. (AP Photo/Ramon Espinosa)
In a photo taken from the Tijuana, Mexico, side of the border wall, a U.S. Border Patrol agent is seen as Honduran migrants who jumped the wall surrender on the U.S. side, Sunday, Dec. 2, 2018. Thousands of migrants who traveled via caravan are seeking asylum in the U.S., but face a decision between waiting months or crossing illegally, because the U.S. government only processes a limited number of cases a day at the San Ysidro border crossing in San Diego. (AP Photo/Ramon Espinosa)
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As a candidate, Trump promised to build an "impenetrable, physical, tall, powerful, beautiful" wall on the border that would be paid for by Mexico. Before the Oval Office address, the White House's Office of Management and Budget sent a letter to Congress requesting $5.7 billion for the construction of 234 miles of steel barrier.

Amid a government shutdown over his border wall proposal, Trump will travel to McAllen, Texas Thursday to make the case for building the additional border barrier.

House Homeland Security Committee Chairman Rep. Bennie Thompson, D.-Miss., said there is "nothing special" about Trump's wall design.

"President Trump likes to pretend a wall will solve all our problems, but it's been clear for some time that it is little more than a very expensive vanity project," said Thompson. "Whether steel or concrete, there is nothing special about his wall and it will not secure our borders. Democrats are willing to work with the administration to improve our border security, but let's get back to proven and effective solutions."

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