"The wall goes up; it drops by 56 per cent", Chavez said. More than half of those are families with children, who require extra care.
The initial threat Trump issued last week was that he'd close down the southern border within a week if Mexico didn't increase migrant apprehensions on its southern border, where Central American migrants seeking to move northward may eventually try to illegally enter the US.
Trump, who campaigned on a promise to secure the border, has thrown virtually every option his aides have been able to think of at the problem, to little avail. Whether it's asylum. Whether it's anything you want.
Trump is also threatening tariffs if Mexico doesn't halt the flow of illegal drugs across the border.
Harvard professor Ieva Jusionyte wrote in his book Threshold about his experiences working as an emergency medical technician (EMT) on both sides of the USA border with Mexico.
"We're also going to do something having to do with tariffs on drugs because. hundreds of thousands of lives (are) ruined a year in our country", he said.
The filing came a day after House leaders voted to authorize a lawsuit against Trump over his national emergency declaration and on the same day when Trump visited California's southern border city of Calexico, 250 km southeast of Los Angeles, and inspected construction works of the border wall there.
"I'm totally willing to close the border", he said, "but Mexico over the last four days they have done more than they have ever done..."
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Waving US and Mexican flags, the protesters carried signs with messages such as "Stop separating families" and "If you build the wall, my generation will tear it down".
Democrats generally oppose Mr Trump's wall proposal, suggesting alternative types of enhanced border security that they argue would be more effective and less costly.
Trump has made fighting illegal immigration from Mexico and Central America a key part of his agenda, but shutting down one of the world's most used borders might be a step too far, even for many of his fellow Republicans.
Trump said the imposing structure, made of reinforced steel slats spaced apart so U.S. Border Patrol agents can see the other side, is "anti-climb" and can be made quickly.
"They could stop them at the southern border, their southern border". Most of the fencing, however, was built during the administration of George W. Bush, and have been updated and maintained throughout other administrations.
Mr Trump's administration has not, however, put up any walls in any places along the 1,954-mile border where no barriers existed when he was inaugurated.
Construction for that small chunk of fencing cost about $18 million, began in February 2018 and was completed in October. Plans to replace that fence date to 2009, during the beginning of President Barack Obama's tenure.