The Republican attorneys general for a dozen states are suing the Environmental Protection Agency for documents pertaining to the agency’s legal approach with green groups.

The lawsuit filed Tuesday in a federal court in Oklahoma seeks documents from environmental groups such as Greenpeace and the Sierra Club in lawsuits that preceded new regulations. The attorneys general say such material could reveal whether the EPA is using a legal tactic known as “sue and settle.”

“Sue and settle” occurs when an organization files a lawsuit against an agency for missing a deadline for issuing a rule, or hasn’t properly administered a regulation. Agencies can choose to defend themselves, or settle with the petitioner.

Industry and Republicans allege the EPA has acted in cahoots with green groups on that strategy as a way to impose new regulations without letting states get involved.