President Donald Trump signed an executive order Monday on the stage during a rally in Grand Island, Nebraska, which seeks to cut diesel costs by temporarily allowing off-road “dyed” diesel for highway use. "Today I'm announcing another unprecedented step to bring down costs," Trump said during the rally. "For many years, farm vehicles, construction equipment and other off-road vehicles have used what is known as red-dye diesel ... Tonight I'm going to sign an historic executive order to officially waive the off-road requirement and allow anyone to purchase tax-free red-dye diesel for any reason."