Residents of Kansas, Georgia and Alabama will have to prove they are U.S. citizens when registering to vote for federal elections using a national form, a judge ruled Wednesday.

U.S. District Judge Richard Leon sided against a coalition of voting rights groups that sued a U.S. elections official who changed the proof-of-citizenship requirements on the federal registration form at the request of the three states and without public notice. Residents of other states only need to swear that they are citizens, not show proof.

Leon refused to issue a temporary injunction sought by voting rights advocates to overturn the move by Brian Newby, the executive director of the U.S. Election Assistance Commission, until the case can be decided on its merits at trial. No trial date has been set.

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