The migrant caravan says it's determined to reach the USA border, where they hope President Trump will have a "change of heart" and allow its several thousand members to seek refuge and asylum in the United States.
The latest moves were seen by both supporters and opponents as an escalation of the administration's confrontational stance on immigration, striking political and legal nerves around the country.
There are now 2,100 National Guardsmen along the border, but the DHS request could lead to the first large-scale deployment of active-duty USA military forces to support the border protection mission under Trump.
Thus, Mexico is trying to stop the advance of the so-called caravan of migrants to the USA border, which causes irritation in Washington.
Police let the caravan proceed after representatives from Mexico's National Human Rights Commission persuaded them that a rural stretch of the highway without shade, toilets or water was no place for migrants to entertain an offer of asylum.
The latest allotment of troops will include logistics, engineering, medical and aviation specialists, the Pentagon said Friday, more than a day after us officials confirmed DHS had requested the deployment at Trump's behest.
The Pentagon did not comment on potential troop numbers, which US officials have told Reuters could be at least 800 active-duty troops and begin deploying as soon as Tuesday.
Homeland Security Secretary Kirstjen Nielsen said that all options were being considered to stop people getting into the U.S. illegally as she unveiled the 30-foot fence in California.
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There were already about 2,000 National Guard troops there under a previous Pentagon arrangement.
The migrant caravan swelled to an estimated 7,000 people last week after hundreds of poverty-stricken Hondurans left their country two weeks ago.
"I always say, it's my fault". Civilian activists carrying guns and bulletproof vests are meanwhile gathering at the US' southern border in order to lend support to the US National Guard and Border Patrol, responsible for security in the area. He is considering measures that would bar migrants from crossing the border and prevent them from applying for asylum.
"We will absolutely not tolerate violence against border patrol in this situation", Nielsen said.
On Sunday, migrant caravan leaders announced they would "rest" for at least one day on reports of a missing child, whom some caravan members believe has been abducted, NBC News reports. But those members remain under the control of the governors of the states where they're positioned, and their activities are limited to supportive roles, such as providing surveillance.
Defense Secretary Jim Mattis on Friday approved a request from the Department of Homeland Security to send a second deployment of U.S. military troops to the U.S. -Mexico border after President Donald Trump pledged to send servicemembers to halt illegal immigration.
DHS asked for help in various forms.
Federal law prohibits the use of active duty service members for law enforcement inside the USA unless specifically authorized by Congress.