Arizona filed a motion to intervene in Nevada's federal lawsuit against the Trump administration on October 16, 2026, challenging federal operational plans for the Colorado River.

From the articleArizona joins Nevada to fight proposed cuts to their shares of Colorado RiverAlso in Arizona escalates water war, intervening in lawsuit over federal Colorado River cuts, Arizona joins lawsuit over required water cuts in Colorado River plan, Arizona Joins Nevada Suit Over Interior Colorado River Cuts (1)