A federal appeals court reversed its own ruling that upheld parts of an Arizona law that would stop some people from voting if they have not provided proof of citizenship.

In July, the 9th U.S. Circuit Court of Appeals rejected a request by Republican legislative leaders to delay a ruling by a trial judge barring enforcement of such a ban. But the judges issued a temporary stay ordering that anyone who tries to register to vote using a state form is required at the same time to provide documented proof of citizenship.

If they don’t, election officials must reject that application, the judges ruled.

Previously, election officials would register those individuals as federal-only voters who can only cast ballots in certain races, like the presidential election. That’s because state law requires proof of citizenship to register, but federal law does not.