Gov. Pat Quinn's running mate says Republican Bruce Rauner's plan to roll back the temporary state income tax increase would "decimate" education in Illinois.

Paul Vallas is the Democratic candidate for lieutenant governor and former head of public schools in Chicago and other big cities.

He says if Rauner rolled back the income-tax increase, public schools would see a $4 billion-a-year loss in state revenue. That's because the income tax increase brings in $8 billion a year and education makes up half of the discretionary part of the budget.

Rauner campaign spokesman Mike Schrimpf says the numbers Vallas uses "are just made up."

He says even though Quinn raised the tax 67 percent in 2011, he cut school spending by $500 million. He says Rauner will "fully fund our schools."