A plan to rescue Illinois' worst-in-the-country pension problem faces uncertainty in the final full day of the lame-duck legislative session.

Members of a House committee approved a proposal calling for more employee contributions and freezing cost-of-living increases.

Backers say it's a compromise on a complex problem that addresses many concerns. But opponents question whether it's constitutional.

It could come up for a floor vote Tuesday. But the bill's sponsor, Democratic Rep. Elaine Nekritz, says Democrats and Republicans are assessing how many lawmakers support the measure before deciding whether to call for a vote.

If it wins House approval, it'd move to the Senate, which isn't currently in session. Senate President John Cullerton has said he could call senators back Tuesday.

New lawmakers are sworn in Wednesday.