The fight over how to address Illinois' worst-in-the-nation pension shortfall is likely to move to the courts following passage of a landmark bill. The Illinois Legislature approved a measure Tuesday to eliminate the state's $100 billion unfunded pension liability by cutting benefits for workers and retirees. Governor Pat Quinn says he will sign the bill. If he does, public employee unions say they'll file a lawsuit. They claim it violates a provision of the state constitution that prohibits cutting pension benefits. The bill is estimated to save $160 billion over 30 years.