The Pentagon announced Sunday that 3,750 troops additional U.S. troops will be sent to the southern border to aid in border security operations.

Troops will work with Customs and Border Protection to install 150 miles of razor wiring between ports of entry as well as assist with mobile surveillance.

“We will continue to evaluate the force composition required to meet the mission to protect and secure the southern border,” the Pentagon said in a statement.

The deployment, which brings the total number of troops assisting border security up to approximately 4,350, will last for 90 days and was approved by Acting Secretary of Defense Patrick Shanahan on January 11.

The Trump administration’s move comes just after the 35-day partial shutdown in December and January, which broke the record for the longest in U.S. history. The government shut down just before Christmas when Republicans and Democrats reached an impasse over the $5.7 billion for border wall funding the president is demanding. Trump eventually signed a stopgap spending bill that funds the government until February 15, but Congress risks another shutdown if lawmakers again fail to reach a compromise.

House Speaker Nancy Pelosi has said multiple times that the final spending bill will not include any border wall construction funding. Trump has floated declaring a national emergency or assigning the military to build the wall if Congress will not approve money for it.

“More troops being sent to the Southern Border to stop the attempted Invasion of Illegals, through large Caravans, into our Country. We have stopped the previous Caravans, and we will stop these also. With a Wall it would be soooo much easier and less expensive. Being Built!” Trump wrote in a tweet last week.

“We’re going to have a strong border. And the only way you have a strong border is you need a physical barrier. You need a wall. And anybody that says you don’t, they’re just playing games,” the president told CBS.