The Illinois Senate is expected to approve a union-supported pension reform bill. But the measure faces an uncertain future in the House, where lawmakers passed a competing proposal last week.
Senate President John Cullerton's legislation would give workers and retirees a choice in retirement benefits.
The Chicago Democrat negotiated the plan with the state's largest labor unions. He says it's the only approach to solving Illinois' nearly $100 billion pension crisis that will hold up in court.
But House Speaker Michael Madigan prefers his plan, which he says could save the state three times more money than Cullerton's proposal.
Public-employee unions have said they will file a lawsuit if Madigan's bill is enacted. They say it violates a clause in the state constitution that says pension benefits can't be reduced.