CHICAGO — A group of retired teachers and school officials has launched the first legal challenge to Illinois' controversial pension overhaul in a lawsuit that claims the new law is unconstitutional.

The lawsuit, filed by members of the Illinois Retired Teachers Association late Friday in Cook County Circuit Court in Chicago, says the law violates the state constitution's contract and pension clauses. It was filed on behalf of eight non-union retirees and other school officials who are part of the state's Teacher Retirement System.

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