President Trump vowed to cap California’s gas tax, a move that could provide long-overdue relief to drivers who continue to pay the highest gas prices in the nation. “Gasoline in California could be $2.50,” President Trump speculated. DEVELOPING: President Trump is considering a federal cap on state fuel taxes to provide relief at the pump. “To me, it’s always double the rest of the country, which is always depressing and I’m just wondering, where it all goes?” President Trump said. It remains to be seen whether President Trump will follow through on capping California’s gas tax.