Central American migrants wait in line in hopes of receiving donated food and hygiene supplies, outside of a sports complex serving as a shelter for more than 5,000 Central American migrants, in Tijuana, Mexico.
The President also told Politico that he "was in no mood" to reach a compromise with Democrats on a large-scale immigration deal and wants to wait to form a compromise on "Dreamers" - undocumented immigrants brought to the United States as children - until after current court challenges to the program are decided. The network is the largest US owner of local TV stations by number of outlets.
The President later also denied that the tear gas was used against children.
The Mexican Foreign Ministry asked the U.S. authorities to conduct a thorough investigation of the events in which non-lethal weapons were used from the USA towards Mexico.
Speaking to reporters outside the White House, he said: "First of all, the tear gas is a very minor form of the tear gas itself".
The fate of the thousands of migrants stranded on the border remains unknown, but the extreme rhetoric invoking the Holocaust, child-kidnappers and invasions is nearly certain to persist.
Democrats have refused to support Trump's border wall, which was a major part of his 2016 election platform, but have backed other border security measures.
Anytime there is a use of force incident on the border, including non-lethal methods, an internal review is done to determine that all policies are followed.
A Honduran woman named Mirna Contreras sought to explain that the border melee on Sunday has had a big impact on the migrants' morale.More news: Trump Backs Under-Fire Senator Hyde-Smith
The migrants' presence has drawn demonstrators - for and against them - and threats from Trump to close the US-Mexico border. But we've, during certain time, closed the border.
When they arrived, they were tear-gassed in a protest gone wrong and they now face months in limbo in a squalid camp waiting to apply for asylum.
Now, about 1,800 of the 5,600 active-duty troops deployed to the southwest border with Mexico are in California, according to numbers provided Monday by the Army. Given the massive backlog at the nearby port of entry, it could be weeks before they have a chance to cross the border and begin to make their case.
"Because I anticipate this chain of events could easily happen again at any minute, I actually asked for an expedited review of the use of force", said San Diego sector Chief Patrol Agent Rodney Scott.
By Dec. 7, Congress must pass a spending bill, estimated at US$312 billion, to keep some government agencies funded, including the Department of Homeland Security, which polices the border and immigration.
"[CBP] effectively managed an extremely unsafe situation involving over 1,000 individuals who sought to enter the United States unlawfully in large groups".
"I see it as impossible for them to want to give us asylum", she said. The country's Interior Department said about 500 people attempted to rush the border, while USA authorities put the number at 1,000.
Fewer than 100 migrants a day are allowed to approach the border crossing and obtain an interview to seek asylum. He says he's heard people talk of Rosarito, a beach town popular with U.S. tourists about a 40-minute drive south of Tijuana.
Claiming that the crisis on the border has "greatly escalated", Epshteyn repeated the right-wing talking point that the tear gas was warranted due to some of the migrants throwing "rocks and bottles" at US border enforcement.