"The Guardian" reported in July 2017 that emails and other records released by the Oklahoma attorney general's office showed a close relationship between Pruitt and various Koch brothers-backed advocacy groups, including the American Legislative Exchange Council. The documents showed that while serving as Oklahoma attorney general, Pruitt "acted in close concert with oil and gas companies to challenge environmental regulations, even putting his letterhead to a complaint filed by one firm, Devon Energy." Devon has since benefited from policies implemented by Pruitt. Emails showed that American Fuel and Petrochemical Manufacturers "provided Pruitt's office with template language to oppose ozone limits and the renewable fuel standard program in 2013."