A Cook County judge is allowing Illinois Attorney General Lisa Madigan to intervene as a third party in a lawsuit that challenges Gov. Rod Blagojevich’s authority to expand a government health-care program without lawmakers’ approval.

Opposing Blagojevich in the lawsuit are Riverside attorney Richard Caro, former Republican gubernatorial candidate Ronald Gidwitz and Greg Baise, president of the Illinois Manufacturers’ Association. They say the Democratic governor overstepped his authority by expanding a program the General Assembly did not fund.