Immigration and Customs Enforcement officials will be given access to the personal data of the nation’s 79 million Medicaid enrollees, including home addresses and ethnicities, to track down immigrants who may not be living legally in the United States, according to an agreement obtained by The Associated Press.

The information will give ICE officials the ability to find “the location of aliens” across the country, says the agreement signed Monday between the Centers for Medicare and Medicaid Services and the Department of Homeland Security. The agreement has not been announced publicly.