Trump calls new border wall a 'world-class security system'

President Donald Trump talks with reporters as he tours a section of the southern border wall, Wednesday, Sept. 18, 2019, in Otay Mesa, Calif., as acting Homeland Secretary Kevin McAleenan listens, (AP Photo/Evan Vucci)
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SAN DIEGO (AP) — President Donald Trump signed his name Wednesday on a newly constructed section of the U.S.-Mexico border wall, calling it a "world-class security system" that will be virtually impenetrable.

Trump toured a section of the border wall in San Diego's Otay Mesa area. It was a return trip for the president, who traveled there in March 2018 to see border wall prototypes that authorities later destroyed to make way for 14 miles (22.4 kilometers) of steel, concrete-filled bollards currently under construction.

Before construction began, the border in San Diego was protected by an initial layer of sheet metal that was easily blow-torched and a second, more formidable layer that could be compromised with powerful, battery-operated saws.

"It was like a sheet metal and people would just knock it over like just routinely," Trump said, referring to the initial layer that was replaced. He stood with construction workers and top Customs and Border Protection, Army Corps of Engineers and homeland security officials.

President Donald Trump signs his name as he tours a section of the southern border wall, Wednesday, Sept. 18, 2019, in Otay Mesa, Calif. (AP Photo/Evan Vucci)

Mark Morgan, acting commissioner of U.S. Customs and Border Protection, defended the project, dismissing critics who call it the "president's vanity wall."

"I'm here to tell you that's false," he said, telling reporters that Trump reached out to border experts to find out what they needed. "You listened to the agents," he told Trump.

Trump highlighted features of the wall, which he said have been studied by three other countries. He said the wall absorbs heat — "You can fry an egg on that wall." The concrete goes deep into the ground to prevent tunneling. And agents can see through it to spot possible threats on the Mexican side of the border, he said.

"When the wall is built, it will be virtually impossible to come over illegally, and then we're able to take border control and put them at points of entry," Trump said.

He heaped praise on the Mexican government, especially for sending tens of thousands of troops to its northern and southern borders to help slow the flow of migrants headed toward the United States. He said President Andres Manuel Lopez Obrador "has been great."

"We're all thrilled," Trump said. "You know Mexico has never done anything to impede people from pouring into our country and now they're doing just the opposite. They've really been incredible."

The president reveled in details of construction, saying Border Patrol and military officials persuaded him to adopt more expensive designs. He said he dropped a preference for solid concrete, instead opting for concrete-filled steel bollards that allow agents to see through to Mexico to spot assailants throwing rocks or other projectiles. He agreed to go along with barriers that are 30 feet high and double-layered in heavily traveled areas.

"It's the Rolls-Royce version," Trump said.

When Trump asked Army Corps Lt. Gen. Todd Semonite to explain how technology embedded in the wall alerts agents to illegal activity, he was told, "Sir, there could be some merit in not discussing it."

Semonite offered new details on the pace of construction that underscored how quickly the administration plans to move.

It has built 66 miles (106 kilometers) so far, has 251 miles (403 kilometers) in various stages of construction at 17 sites and contracts for 163 miles (262 kilometers) planned in the next 90 days, the general said. Additional land on private property is expected to take more time.

Crews are installing 270 panels a day, each one with eight bollards.

Trump, whose construction targets have shifted, said he expects to build up to about 550 miles (885 kilometers) of wall along the 1,954-mile (3,126-kilometer) border and said the administration will pause at about 400 miles (643 kilometers) to assess what more is needed.

Trump said cost concerns led him to put aside his preference to paint the wall black, which absorbs heat. He said the wall was "a good, strong rust color" and could be painted later.

Trump is riding a string of wins on the wall and on immigration in general. Arrests on the Mexican border arrests plunged in August, well beyond the usual summer dip, from a 13-year high reached in May. Arrests are still relatively high, topping 50,000 in 10 of the last 11 months, compared with only eight months over the previous decade.

Last week, the Supreme Court gave Trump a green light to deny asylum to anyone who passes through another country on the way to the U.S. border with Mexico without having first sought protection in the third country.

The Pentagon recently diverted $3.6 billion from 127 military construction projects to build 175 miles (280 kilometers) of barriers on the border. Trump had promised during the 2016 presidential campaign that Mexico would pay for the wall.

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