(May 22, 2020, 2:08 PM EDT) -- SAN FRANCISCO — Advocates for the environment on May 22 filed a brief in the Ninth Circuit U.S. Court of Appeals contending that a district court correctly held that the U.S. Army Corps of Engineers failed to perform “a full and proper analysis” of the environmental impact that would be caused by construction of the Keystone XL Pipeline and, therefore, the permit allowing the construction is “unlawful” and the Army Corps’ motion to stay the ruling is “unwarranted” (Northern Plains Resource Council, et al. v. U.S. Army Corps of Engineers, 20-35412, 9th Cir.)....