A conservative legal group filed a lawsuit against the Environmental Protection Agency on Tuesday, accusing the agency of stonewalling records requests and engaging in political bias when granting fee waivers for documents.

The Washington, D.C.-based Energy & Environment Legal Institute filed the suit in U.S. District Court in an attempt to force the EPA to turn over records related to the agency’s controversial veto of a permit for a coal mine in West Virginia.

The group claims it was blocked from accessing records under the Freedom of Information Act about the permit decision, which was based on the EPA’s assertion that surface mining is harmful to mayfly populations, according to a news release.

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