PHOENIX — The U.S. Supreme Court rejected a claim by the Navajo Nation on Thursday that the United States held 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 …PHOENIX — The U.S. Supreme Court rejected a claim by the Navajo Nation on Thursday that the United States held 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 …