As President Donald Trump prepares to tour wildfire damage in California, he’s zeroing in on one of his frequent targets for criticism: State water policy.

State water restrictions, fueled by historic drought and climate change, have taken a toll on Southern California golf courses in recent years.

Sea water, in theory, could be used to help a fire. But, its salty components can do more harm than good, which is why firefighters typically avoid using it unless absolutely necessary. Salt is corrosive, and it can damage metal equipment, including critical equipment in water dumping planes and fire pumps.