Pollution at a Hilcorp well site in New Mexico in May 2021 (Courtesy of Earthworks)This story was originally published by ProPublica. It was before dawn on a Friday in January when a Gulfstream G600 with the burnt-orange Texas Longhorns logo on its tail landed at Dulles airport outside Washington, D.C. Its owner, a little-known oil billionaire named Jeffery Hildebrand, had been summoned to the White House. By mid-afternoon he was in the East Roo…