Twenty-three industry and business groups and nine states, in separate briefs filed in the U.S. Court of Appeals for the District of Columbia Circuit, argued that EPA's tailoring rule for greenhouse gas emissions for large stationary sources violates the Clean Air Act and should be eliminated. The nine states, led by Texas, said in their brief that EPA's reasoning for issuing the tailoring rule, which is meant to exempt smaller sources of greenhouse gas emission from obtaining burdensome permits, is effectively a “rewriting of the Clean Air Act”. EPA claims the tailoring rule is a necessary step because the current permitting regime would result in 6 million new emissions sources needing to obtain permits.