The White House on Monday defended the Department of Homeland Security’s tracking of terrorists who have crossed the U.S.-Mexico border, saying its efforts mean “the system is working.”

The head of the department, Alejandro Mayorkas, has come under fire in recent days for forming a Disinformation Governance Board and for the fact that 42 individuals who were on the terrorist screening list were encountered at the border. Mayorkas told Fox News the Biden administration has a “handle on it.”