Mealey's (May 31, 2019, 1:54 PM EDT) -- TULSA, Okla. — The Pawnee Nation on May 30 filed a brief in Oklahoma federal court contending that when the Trump administration approved permits for hydraulic fracturing on tribal land, it violated federal law by failing to address the impact of drilling on water pollution and did not assess the risk of earthquakes (Pawnee Nation of Oklahoma, et al. v. David Bernhardt, et al., No. 16-cv-697, N.D. Okla.)....