Mealey's (April 25, 2019, 1:51 PM EDT) -- SAN FRANCISCO — Two Native American tribes on April 23 filed a joint brief in the Ninth Circuit U.S. Court of Appeals contending that a district court is “properly situated to consider mootness” as well as vacatur and, therefore, a lawsuit against the Trump administration concerning the Keystone XL pipeline should be remanded for further consideration (Indigenous Environmental Network, et al. v. U.S. Department of State, et al., No. 18-36068, 9th Cir.)....