The Supreme Court began oral arguments in a case on Monday that pits the Navajo Nation against the Biden administration, along with four Southwest states, over the tribe’s rights to the Colorado River, the West’s most important waterway. POLITICO’s Annie Snider breaks down the arguments and what’s at stake. Plus, a federal judge blocks President Joe Biden’s WOTUS rule in Texas and Idaho.    Josh Siegel is an energy reporter for POLITICO.  Annie Snider covers water issues for POLITICO Pro.  Nirmal Mulaikal is a POLITICO audio host-producer. Raghu Manavalan is a senior editor for POLITICO audio. Jenny Ament is the executive producer of POLITICO’s audio department. Learn more about your ad choices. Visit megaphone.fm/adchoices