The Department of Homeland Security said Thursday that it has begun notifying hundreds of thousands of Cubans, Haitians, Nicaraguans and Venezuelans that their temporary permission to live and work in the United States has been revoked and that they should leave the country.

The Department of Homeland Security on Thursday told hundreds of thousands of migrants that their permission to live and work in the United States had been revoked and they should leave the country, according to a copy of the notice obtained by CNN.

The Department of Homeland Security is already telling migrants from four countries in the Americas to leave the U.S. after their legal status was revoked