Trump initially ordered the deployment of thousands of active-duty troops to the border with Mexico in October last year to deter members of a caravan of Central American migrants from illegally entering the United States.

The move, carried out shortly before the November midterm elections, was embraced by Trump's allies and supporters, while critics slammed it as "a political stunt."

Acting Defense Secretary Patrick Shanahan approved the latest deployment in January to fulfill a request from the Department of Homeland Security for assistance.

The Pentagon said it is "transitioning its support at the southwestern border from hardening ports of entry to mobile surveillance and detection, as well as concertina wire emplacement between ports of entry."

The new troops, the Pentagon said, will be used to install additional wire barriers and provide a large new system of mobile surveillance and monitoring of the border area.

The effort announced Sunday is separate from the potential White House-led effort to use existing Pentagon resources to help build new sections of the border wall, according to cnn.

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