Since April about 2,100 National Guardsmen have been along the border providing a similar mission, but the new active duty deployment was triggered by President Trump's remarks last week that he wanted the military to get involved in dealing with the caravan of migrants from Central America.
A caravan of mostly Hondurans, estimated to number between 3,500 and 7,000, who left their country in mid-October are now in southern Mexico.
The Salvadoran caravan departed from San Salvador, where the members gathered to organise, and members told Efe that they meant to head for the border with Guatemala, then enter Mexico and finally travel the 1,000 or so miles north to the southern USA border.
Participants not deterred by President Trump's warnings as the movement gains steam; Griff Jenkins reports from alongside the caravan in Oaxaca, Mexico.
A US official told ABC News that 2,000 active duty troops have already been placed on "prepared to deploy" orders in anticipation of those requests.
The group promoting the caravan, Pueblo Sin Fronteras, wants a meeting with Mexican authorities in the capital city to discuss migrants' rights and how to handle the caravan moving forward.
Mexico authorities said migrants attacked its agents with rocks, glass bottles and fireworks when they broke through a gate on the Mexican end but were pushed back, and some allegedly carried guns and firebombs. We will, if necessary, to increase the number of military.
The troops will deploy first to Texas, followed by Arizona, and then California, O'Shaughnessy said at a news conference at the Department of Homeland Security.
Earlier in the day, members of the caravan strung out along the highway outside the city of Tapanatepec, some waiting for rides while others plodded toward their goal for the day: Niltepec, about 34 road miles (54 kilometers) to the northwest.
McAleenan said 1,900 asylum-seekers are picked up at USA border crossings a day, many of whom put themselves in the hands of violent human smugglers.
On Monday, he tweeted without providing evidence, "Many Gang Members and some very bad people are mixed into the Caravan heading to our Southern Border".
"We'll be able to spot and identify groups and rapidly deploy CBP personnel where they are needed", O'Shaughnessy said.
Trump says that the USA was "going to be prepared" and that the migrants are "not coming into our country".
The US President said that those illegal immigrants who enter the United States and request for asylum will not be released as long as their cases will not be considered by the immigration court.
Military personnel are legally prohibited from engaging in immigration enforcement.
On Monday he warned that the military would be waiting.
The troops are expected to perform a wide variety of functions such as transporting supplies for the Border Patrol, but not engage directly with migrants seeking to cross the border from Mexico, officials said. USA officials have told Reuters the support mission would be coordinated by the US military's Northern Command.
The U.S. military has already begun delivering jersey barriers to the southern border in conjunction with the deployment plans.
Soldiers from the 541st Sapper Company headed to the southern USA border prepare to board an air transport plane on Tuesday in Ft. Trump claimed members of the caravans "Fought back hard and viciously against Mexico at Northern Border before breaking through".
Air force jets flew over the figure and rose petals were dropped from helicopters as Mr Modi bent in front of the statue. At 182 meters (587 feet), the statue is more than twice the size of the Statue of Liberty in New York City.
The OnePlus 6T employs the same 10nm Qualcomm Snapdragon 845 octa-core SoC clocked up to 2.8 GHz, paired with Andreno 630 GPU. Both the handsets will feature 16MP + 20MP dual rear camera setup on the rear with Sony IMX519 sensor has LED flash also.
Saudi Attorney General Sheikh Saud al-Mojeb reportedly refused to share information from Riyadh's own investigation. Mr Khashoggi entered the consulate in Istanbul on October 2 to get the needed paperwork to marry his partner.
We did say that he, and you, should understand your words matter. "Thus far, they have shown no comprehension of that". In one interview , when asked if he thought he needed to tone down his rhetoric, he said he could " tone it up ".
I'm exhausted , man! I'm exhausted , ' the 49-year-old movie/TV mogul said on Bevy Smith's SiriusXM show on Monday. In addition, Tyler has plans to give her a proper send-off with a farewell stage play tour across the country.
And on October 30 during a walkabout in Auckland , she finally got to meet one young woman whose life she touched many years ago. As we all know, the Queen has a strict policy regarding women from the royal family wearing bright nail paints and fake nails.
If that doesn't happen, at any big club, the manager and recruitment find better players or players who will do that'. Captain James Tavernier has offered an apology to the Rangers support after his side's latest Hampden nightmare.
Steve Smith and David Warner were sent home and handed hefty bans by Cricket Australia after the admission of ball-tampering. But an independent review commissioned by CA found the body to be "arrogant and controlling" and partly to blame.
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