President Trump’s ethanol policy could help him outpace competitors in the 2020 presidential election in Iowa, according to ethanol’s biggest supporter in the Senate, Republican Chuck Grassley.

The senior senator from Iowa believes Trump ran on ethanol and is delivering on his promise to expand sales of the fuel with a new plan slated to be finalized June 1. This gives the president a leg up over his challengers, who can’t claim nearly the same support for the corn-based fuel and farm country, according to Grassley.