Republican gubernatorial candidate Bruce Rauner is urging the high court to take up the issue "immediately'' once the lower court issues a ruling. The decision must be made within days because the ballot must be certified by Friday.
Rauner predicts the measure will pass overwhelmingly if it's on the ballot.
A term limits committee gathered about 600,000 signatures to limit legislators to eight years in office and increase the number of votes needed to override a veto.
But attorneys with ties to top Democrats sued to keep the measure off the ballot. A circuit court called the effort unconstitutional.
