A coalition of 14 Republican-led states on Monday urged the U.S. Election Assistance Commission to adopt new federal rules requiring proof of U.S. citizenship to register to vote, marking the latest front in the GOP’s nationwide election integrity campaign.

The multistate effort, led by Texas Attorney General Ken Paxton, backs a petition from America First Legal, the conservative group founded by senior Trump adviser Stephen Miller. The petition asks the EAC to amend its regulations and the federal registration form under the National Voter Registration Act to mandate documentary proof of citizenship, such as a birth certificate or passport, when registering to vote.