(c) Sessions of each house of the General Assembly and
meetings of committees, joint committees and legislative
commissions shall be open to the public. Sessions and
committee meetings of a house may be closed to the public if
two-thirds of the members elected to that house determine
that the public interest so requires; and meetings of joint
committees and legislative commissions may be so closed if
two-thirds of the members elected to each house so determine.
Structure Illinois constitution