U.S. Immigration and Customs Enforcement officials will gain access to personally identifiable information for all of the nation’s 79 million Medicaid enrollees.

An agreement signed Monday between the Centers for Medicare and Medicaid Services and the Department of Homeland Security has given U.S. Immigration and Customs Enforcement access to the personal data of all Medicaid enrollees, according to a report from The Associated Press.

The immigration agency will use Medicaid data to identify and locate people it believes are in the country unlawfully.