Supreme Court denies Navajo Nation's water claim in Colorado River case.

The US Supreme Court has ruled against the Navajo Nation's claim that the US government had an obligation to determine the tribe's water needs and secure supplies to meet those needs. The 5-4 decision represents a setback for the tribe, which still lacks reliable water sources in many communities. The Navajo Nation is the largest Indigenous tribe on the Colorado River without defined water rights. The ruling has implications for other tribes seeking water rights and comes as the region faces a third decade of intensifying drought.