The ACLU has filed a lawsuit challenging Missouri's new voter ID law.

The group is seeking a temporary restraining order to block the law from going into effect before next month's special election in St. Louis.

Early voting begins next week in the race to fill mayor Lyda Krewson's vacant alderman seat. The new law requires voters to show a photo ID before casting a ballot.

The ACLU claims the state failed to provide voter education and poll worker training as required by law.