A top House Republican sent a letter to Homeland Security Secretary Jeh Johnson on Friday, ordering him to stop an Obama administration executive action that creates a pathway to citizenship for hundreds of thousands of illegal immigrants.

House Homeland Security Committee Chairman Bob Goodlatte, R-Va., said his panel has discovered that more than 4,000 people have been granted a path to citizenship under the Obama Administration’s 2012 Deferred Action for Childhood Arrivals policy. The policy allows people who arrived here illegally as children to receive work permits and gain access to some federal benefits.