Thousands of pages of emails between newly confirmed EPA administrator Scott Pruitt and fossil fuel companies during his time as Oklahoma attorney general—released per court order on Tuesday night—confirm “a close and friendly relationship” between the man now charged with protecting the U.S. environment and entities seeking to hamper those efforts.

The Oklahoma Attorney General’s office on Tuesday released a batch of more than 7,500 pages of emails and other records, after a judge last week found Pruitt in violation of the state’s Open Records Act for improperly withholding public records requested by the Center for Media and Democracy (CMD). The group made the documents public on Wednesday. 

They show that Pruitt—who sued the EPA more than a dozen times as attorney general—”closely coordinated with major oil and gas producers, electric utilities, and political groups with ties to the libertarian billionaire brothers Charles G. and David H. Koch to roll back environmental regulations,” according to the New York Times.

The Times continued:

Furthermore, reporter Steve Horn wrote for DeSmog Blog, “[t]he emails also shed new light on the relationship between Pruitt and the sphere of advocacy outfits and legal groups funded by Koch Industries’ billionaires Charles and David Koch.”

One 2013 note from Matt Ball, an executive at the Koch-backed Americans for Prosperity, to Pruitt and an Oklahoma congressman read in part: “Thank you to your respective bosses and all they are doing to push back against President [Barack] Obama’s EPA and its axis with liberal environmental groups to increase energy costs for Oklahomans and American families across the states. You both work for true champions of freedom and liberty!”

The Koch brothers worked hard to get Pruitt confirmed.