The Pentagon announced Sunday, Feb. 3, that it will send an additional 3,750 troops to the southwest border to help further support U.S. Customs and Border Protection (CBP).

The deployment will bring the total number of active-duty troops on the U.S.-Mexico border to 4,350, Fox News reported.

“Additional units are being deployed for 90 days, and we will continue to evaluate the force composition required to meet the mission to protect and secure the southern border,” the Pentagon said.

Roughly 2,400 active duty forces are currently at the border. A large number are going home and being replaced by the new deployment.

The announcement is in line with what acting Defense Secretary Patrick Shanahan said on Tuesday when he provided for the first time new estimates for the next phase of military aid, according to The Associated Press.

The Pentagon would send “several thousand” more American troops to the southern border to provide additional support to Homeland Security, Shanahan said, adding that the troops would install additional wire barriers and provide a large new system of mobile surveillance and monitoring of the border area.

The first active-duty troops were sent to the border around Oct. 30 after President Donald Trump ordered the deployments in response to the impending arrival of a caravan of asylum-seekers from Central America. The mission ended Dec. 15 and has since been extended twice.

A congressional committee has been set up to find a deal on border security funding to avert another partial government shutdown. Trump has hinted he would declare a national emergency if the deal does not include the $5.7 billion needed to build his long-sought after border wall.