The nonpartisan Congressional Research Service says Congress has the power to block funding for President Obama’s executive action on immigration, refuting a position taken by the top House appropriator.

House Appropriations Committee Chairman Hal Rogers, R-Ky., has argued that Congress can’t block funding to U.S. Citizenship and Immigration Services, the agency charged with enforcing the president’s calls to authorize work permits and other paperwork for illegal immigrants living in the U.S., because it operates mostly on fees it collects rather than federal tax revenue.