Arizona officials have joined officials from Kansas in asking a federal judge to expedite changes in federal voter registration forms to comply with the states' proof-of-citizenship laws.

The two states filed their request for a preliminary court order Wednesday in Kansas.

The request asks that the federal Election Assistance Commission be required to change the federal voter registration forms used in the two states to require proof of citizenship. That is the law in Arizona and Kansas.

The U.S. Supreme Court ruled on the Arizona law, saying the state was required to use the federal voter registration form, which does not require proof of citizenship.

Arizona Secretary of State Ken Bennett, who oversees the state's voter registration and elections, asked Attorney General Tom Horne for his opinion on how the state should handle the differing state and federal registration requirements.

Horne's opinion earlier this month said the state needed to set up separate voter classes and registration systems, in effect requiring voters to register twice, once for federal elections, including president, U.S. Senate and U.S. House, and another time for state and local elections.

The Associated Press contributed to this story.