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Thousands of additional active-duty US troops are being ordered to the southern US border with Mexico, just two days after President Donald Trump ordered the US military to ramp up its presence there, according to officials familiar with the matter.

There are already about 2,200 active duty forces at the border as part of Joint Task Force-North, the US Northern Command’s border mission based in El Paso, Texas. They help support US Customs and Border Protection’s work there, mostly performing logistical and bureaucratic tasks such as data entry, detection and surveillance, and vehicle maintenance.

It is not yet clear which specific units will be ordered to the border.

There is also a National Guard contingent at the border called Operation Lonestar, led by the Texas National Guard. It is unclear how many troops are currently with the mission; The Texas Military Department did not respond to questions from CNN regarding the current number of troops assigned to the mission.

The additional active duty troops being sent to the border this week will do much of the same, the officials said, and are expected to add to and expand Joint Task Force-North.

They will help maintain operational readiness for Border Patrol, assist in command and control centers and provide more intelligence specialists to assess threats and migrant flows, according to sources familiar with the planning.

The troops are also expected to augment air assets and assist in air operations.

Even more active troops are expected to be deployed to the border in the coming weeks and months, one of the officials said, with this first wave laying the groundwork for a larger military footprint.

It is not clear whether the troops will be armed. But none of the active troops are authorized to perform any law enforcement role, such as making arrests or seizing drugs, or engaging with migrants beyond helping to transport them to and around various migrant facilities.

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