President Joe Biden plans to create a task force to reunite migrant families separated at the U.S.-Mexico border and unwind certain asylum restrictions in an effort to undo some of the Trump administrations most damaging policies.

The task force, announced on Tuesday, will aim to identify the more than 500 children separated from family members who have yet to be located and will present proposals to the president and other federal agencies to help reunite those families.

The task force is to be led by Alejandro Mayorkas, Bidens pick to lead the Department of Homeland Security, and will include officials from DHS, the Department of Health and Human Services and the State Department.

Former President Donald Trump s family separation policy took more than 5,400 children from their parents at the border in 2017 and 2018. The goal was to deter families from coming to the U.S., through a zero tolerance approach, even though many were asylum-seekers with the right to pursue relief here. Instead, when they arrived at the border, the families were torn apart so the parents could be prosecuted for illegal entry while their children were sent to stay in separate facilities, in foster homes, or with other families.

Some of these children were infants and toddlers; many experienced severe trauma as a result of that separation. The president of the American Academy of Pediatrics called it government-sanctioned child abuse .