Over the weekend, violent clashes occurred as the United States attempted to stem the flow of people crossing into the country.
They are finding that they are equally unwelcome in the U.S. Border Patrol agents have fired tear gas at migrants trying to sneak through holes in the fence, and some have reportedly thrown "projectiles" at Border Patrol agents.
While the DHS chief did not comment specifically on her agency's use of tear gas, she did say that CBP was "forced to close the San Ysidro POE [port of entry] to ensure public safety in response to a large [number] of migrants seeking to illegally enter the U.S".
However, reports have emerged migrants using bottles and other missiles to attack agents.
"As the events unfolded, quick, decisive and effective action prevented an extremely unsafe situation", he said.
Mexican police had kept them from walking over a bridge leading to the Mexican port of entry, but the migrants pushed past officers to walk across the Tijuana River below the bridge.
Most of the migrants stumbled back into camp in the northwestern Mexican city of Tijuana, dirty, scared and with ripped clothes.
Duke Has Lost Its First Game Of The 2018-19 Season
The Bulldogs are seeking their second Maui title after racing past Arizona in the second half of the semifinals. Coleman finished with 16 points and five assists in the loss and shot a season-best 60 percent from the floor.
Ivanka Trump used personal mail for government business
Democrats on the House Oversight Committee said the panel would look to investigate Ivanka once Democrats take over the U.S. Emails regarding official White House business are required to be preserved under the presidential records act.
Trump Tough on General Motors For 14,000 Layoffs Announced
Its North American salaried workforce, including engineers and executives, will shrink by 15 percent , or about 8,000 jobs. He won the county by about 6 percentage points, four years after then-President Barack Obama had won it by 23 points.
"First of all, the tear gas is a very minor form of the tear gas itself".
"Mexico should move the flag waving Migrants, many of whom are stone cold criminals, back to their countries", Trump said Monday on Twitter.
President Trump said he would not hesitate to close the border altogether if he feels the US might be losing "control".
The same tear gas agent that the Trump administration is taking heat for deploying against a border mob this weekend is actually used fairly frequently - including a couple of times a month during some years under President Obama, according to Homeland Security data. He said the aim of Sunday's march was to make the migrants' suffering more visible to US and Mexican officials.
Mexico has been in negotiations with the United States over a possible scheme to keep migrants in Mexico while their asylum claims are processed. "Congress, fund the WALL!"
Mario Figueroa - Tijuana's social services department director who is overseeing operations at the sports complex where most of the migrants in the caravan are staying - said as of Friday that of the 4,938 staying there, 933 were women, 889 were children and 3,105 were men, which includes fathers traveling with families along with single men.
Mexico's Interior Ministry said in a statement it would immediately deport those people arrested on its side and would reinforce security. He questioned why parents were approaching the border with children at all, suggesting that some of the adults "grabbed" children to better their chances of entering the US.
Sunday's incident happened after a group of migrants in the Mexican border city of Tijuana rushed at the border fencing.