"What they're doing to your state is a disgrace," Trump said. "After decades of failure and delays in ensuring critical water rights for the people of the state, we are determined to finally get your problems solved."

The official water "record of decision" was signed Wednesday, outlining endangered species rules for California's main water hub. Central Valley politicians have railed for years against water restrictions intended to help salmon and smelt that inhabit the Sacramento and San Joaquin rivers and Delta further north.