Work begins to replace layer of border wall in San Diego

Construction has begun on the fifth border wall project of Donald Trump's presidency, replacing up to 14 miles (22 kilometers) of barrier in San Diego, authorities said Tuesday.

The first panels are in place to replace a steel-mesh fence with 30-foot- (9-meter-) high steel bollards, according to U.S. Customs and Border Protection. SLSCO Ltd. of Galveston, Texas, was awarded a $101 million contract in December, with options for an additional $30 million.

The bollards replace a second layer of barrier that worked like a fortress when it was built about a decade ago but is now often breached with powerful battery-operated saws sold in home improvement stores.

Work on replacing a first layer of San Diego barrier is nearly complete, also 14 miles (22.5 kilometers) long and made of steel bollards up to 30-feet (9-meters) high. The old fence, built in the early 1990s, was made of corrugated steel matting used by the military as temporary runways.

The state of California and major environmental groups sued, unsuccessfully, over wall projects in the state, saying the administration overreached when it waived environmental reviews to speed construction. Last week, a federal appeals court upheld a judge's decision siding with the president.

The latest groundbreaking came three days after Trump declared a national emergency to build his proposed border wall with Mexico. The American Civil Liberties Union on Tuesday filed the fourth legal challenge to the emergency declaration.

Trump inherited barriers covering about one-third of the border. His administration has awarded $1 billion in contracts to cover 97 miles (155 kilometers), the vast majority of it to replace existing barriers. Work on his first extension is scheduled to begin later this month — 14 miles in Texas' Rio Grande Valley.