From CNN:

Republicans will still try to block President Barack Obama from implementing his immigration overhaul — but they won’t risk funding for the Department of Homeland Security to do it, Sen. John Cornyn says. The Texas Republican said Sunday on CBS’ “Face the Nation” that the GOP will in “a targeted way to try to address and defund” what he called an “unconstitutional” executive action to limit deportations for the undocumented parents of U.S. citizens.