Republican lawmakers on Monday issued a scathing report accusing the Environmental Protection Agency of flouting transparency regulations in pursuit of its policy goals.

“The Obama Administration has advanced the most aggressive, far-left environmental agenda ever and developed the most secretive, behind-closed-doors way of doing it. And that’s not by accident,” said Sen. David Vitter (R-La.), the top Republican on the Senate Committee on Environment and Public Works.

The 30-page report, prepared by Republican members of the panel, primarily focuses on EPA activities under former Administrator Lisa Jackson, who left the agency in February.