Several migrants told UPI they worry Mexican authorities will seek to remove them from the camp and deport them after Sunday's march, the surge at the border, and the use of force in response by US authorities.
"As the events unfolded, quick, decisive and effective action prevented an extremely risky situation", he said. He has insisted that each person seeking asylum wait on Mexico's side of the border until their application is processed and their case decided.
Isauro Mejia, 46, of Cortes, Honduras, looked for a cup of coffee Monday morning after spending Sunday caught up in the clash.
"The way things went yesterday ..."
The president now has just a few weeks left to push his fellow Republicans, who currently control both chambers of Congress, to make good on funding the proposed wall before Democrats take control of the US House of Representatives in January following their election gains.
"It is important to note that the fact the Mexican government protects their rights", the commission said, "does not imply a free pass to break the law".
Central American migrants camped in Tijuana, Mexico, on the border with San Diego, Calif., were subdued Monday, a day after US authorities threw tear gas at them as they approached the global line.
Mexican authorities intervened, prompting a rush toward the border by some people, before USA agents fired tear gas.
Nielsen said her agency was prepared to address any future violence by deploying more US military forces.
"We ran, but when you run the gas asphyxiates you more", Zuniga told the AP while cradling her 3-year-old daughter Valery in her arms.
The wind carried fumes from several rounds of tear gas to people hundreds of feet away who were not attempting to enter the U.S., The Associated Press reported.
As the chaos unfolded, shoppers just yards away on the US side streamed in and out of an outlet mall, which eventually closed.
"As I have continually stated, DHS will not tolerate this type of lawlessness and will not hesitate to shut down ports of entry for security and public safety reasons", Nielsen said.
The refugees are legally allowed to apply for asylum in the United States, but this process has been known to take as long as a year.
Francisco Vega, the governor of Baja California, said nearly 9,000 migrants were in the state - mainly in Tijuana, with a lesser number in Mexicali - and called it "an issue of national security". "This is the responsibility of Mexico's government".
Mexico's Interior Ministry said in a statement it would immediately deport those people arrested on its side and would reinforce security.
The migrants, mostly Hondurans, have travelled to the border in large groups, or caravans and now number more than 8,000.
President Donald Trump said the US will close its southern border with Mexico if needed, a day after USA agents shot several rounds of tear gas at migrants, some of whom tried to breach a border fence.
On Monday, Trump tweeted the caravan at the border included "stone cold criminals".
U.S. Customs and Border Protection has used 2-chlorobenzylidene malononitrile, or CS, since 2010, and deployed it 26 times in 2012 and 27 times in 2013. Border Patrol agents countered using "less lethal devices", which included tear gas and "other projectiles", but not rubber bullets. Democrats and even some lawmakers in Trump's own party have resisted his calls to fund his proposed border wall.
CBP Commissioner Kevin McAleenan told reporters Monday that as many as 1,000 people that were part of a migrant caravan traveling through Central America and Mexico sought to enter the U.S. illegally.