Senate Environment and Public Works Committee Chairman Sen. Jim Inhofe told Environmental Protection Agency Administrator Gina McCarthy Friday to hand over information about the extent left-leaning nonprofit advocacy groups’ influenced greenhouse gas regulations on power plants.

“While it is well known that these rules will have a devastating economic impact on state and local governments, businesses, and private citizens, very little is known about the amount of taxpayer dollars and agency resources that have already gone into developing these rules,” the Oklahoma Republican told McCarthy in a letter.