But the governor said the proposal has "too many defects" for him to consider even approving some of the plan.
"It's one thing if you had to make some technical changes here and there," Quinn said. "This bill just falls way short of what the people of Illinois need when it comes to ethics in government."
He also expressed confidence that his veto would survive, adding: "I think I did the right thing."
In his veto message, Quinn focused on the Chicago casino, claiming the Illinois Gaming Board wouldn't have had the same regulatory authority over it as it does over other casinos in the state. He also said the casino would not have to follow the state's procurement code in handing out contracts, which would leave taxpayer-financed contracts "vulnerable to organized crime, unsavory influence and potentially overpriced vendors."
Quinn also criticized the legislation for providing too little support for public education. Past gambling expansions have been designed to bring in more revenue for public services such as schools, but the 1991 law that created riverboat casinos was intended to help economically depressed cities.
The bill is SB1849.
Follow Sophia Tareen at http://twitter.com/sophiatareen .