CHICAGO — The Illinois General Assembly approved an overhaul to the state’s pension system billed by its backers as a “landmark” reform that will stabilize both the system and the state’s fiscal foundation.

Critics attacked the plan as being either too hard on workers or too weak to repair a system saddled with $100.5 billion of unfunded liabilities. Some lawmakers also raised concerns over whether the plan can withstand the legal challenge expected from unions after Gov. Pat Quinn signs the package.

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