The move is likely to increase anxieties inside an already tense agency. Ebell and other transition officials have made little secret about their goal of greatly reducing the EPA's footprint and regulatory reach. Trump has repeatedly criticized the EPA for what he calls a string of onerous, expensive regulations that are hampering businesses. And his nominee to run the agency, Oklahoma Attorney General Scott Pruitt, has repeatedly sued the EPA over the years, challenging its legal authority to regulate everything from mercury pollution to various wetlands and waterways to carbon emissions from power plants.