( January 10, 2024, 3:19 PM EST) -- DENVER — Environmental advocates and Native American groups filed response briefs in the 10th Circuit U.S. Court of Appeals on Jan. 9 in the litigation over President Joseph R. Biden Jr.’s decision to reinstate the original dimensions of Bears Ears and Grand Staircase-Escalante national monuments under the Antiquities Act. The environmental groups contend that the court should affirm the trial court’s holding that Biden had the authority to make the decision, and the Native American groups say the parties challenging it lack standing....