Donald Trump recently unveiled plans "to both increase Ethanol production in our own country and export ethanol all over the world," according to a press release on his website. This is part of his strategy to "rapidly restore American Energy Independence, and Energy dominance, with Iowa ethanol at the center of the action." Iowa is the largest ethanol producer in America, with more than 40 plants based in the state.

Trump's press release doesn't specify how he will increase production, but the motivation behind the pledge seems clear. He argues his Republican rival Ron DeSantis has repeatedly voted in support of legislation that would end the Renewable Fuel Standard, a law that requires renewable fuel – particularly corn starch ethanol – to be mixed into America's fuel supply. The Renewable Fuel Standard is reportedly "widely supported by the ethanol industry," suggesting Trump is keen to start brewing support in the state ahead of the Iowa caucuses on January 15.

What Donald Trump would do if he was US president again