Trump is taking aim at water supplies for an endangered fish, but scientists say he’s missing the point. It’s one of California’s thorniest problems. The nation’s most populous state is full of sprawling cities, vast farmland, rich ecosystems — and it must decide how to divide scarce water resources among them.

On his way to California on Friday, President Trump made some statements about the water situation here during the recent fires. He said, “The water from the north was turned off”; that