WARWICK, R.I. — A Superior Court judge has turned down the state's request to add municipal governments, school districts and scores of other defendants to a lawsuit that challenges the 2011 overhaul of Rhode Island's pension system.

The law, which raised the retirement age, created investment-style retirement plans and suspended annual cost-of-living adjustments, was designed to save the state $4 billion, but public-sector unions and retirees sued.

A proposed out-of-court settlement failed after police union members rejected it.

The state in May asked to add as defendants virtually every group whose workers pay into the retirement system.

The Providence Journal reports Judge Sarah Taft Carter, in a ruling released Tuesday, turned down that request and also declined to confer class status on all state retirees.