Indianapolis Indiana is joining in with 11 other states to sue the Environmental Protection Agency over new carbon dioxide regulations.
Back on June 2, the EPA announced the Clean Air Act, aiming to lessen carbon dioxide emissions from existing power plants.
Under the new rules, each state must reduce emissions from coal-powered plants starting in 2020.
The states’ lawsuit argues that the EPA doesn't have authority to regulate existing sources of air pollution, according to the The Indianapolis Star .
In a statement, Indiana Governor Mike Pence argued such a law can only be passed by congress.