(January 10, 2020, 11:13 AM EST) -- GREAT FALLS, Mont. — A Montana federal judge on Dec. 20 refused to dismiss claims by two Native American tribes that President Trump violated treaties, federal law and the U.S. Constitution by issuing a permit last year allowing work to continue on the controversial Keystone XL pipeline (Rosebud Sioux Tribe, et al. v. Donald J. Trump, et al., No. 4:18-cv-118, D. Mont., 2019 U.S. Dist. LEXIS 223887)....