North Dakota

Protecting the Renewable Fuel Standard is a priority for officials from corn-producing states, as shown by this sign at an RFS rally in Iowa a few years ago.
File: Amy Mayer / Harvest Public Media

Republican and Democratic senators from top corn- and ethanol-producing states say their pressure helped prevent the Environmental Protection Agency from changing rules governing renewable fuel production.

But at least one senator, Iowa Republican Chuck Grassley, says President Trump was their ace in the hole against an EPA chief who has deep ties to the oil and gas industry.