Trump signed an executive order waiving the off-road requirement for red-dye diesel, allowing anyone to purchase tax-free diesel previously restricted to agricultural and off-road use.

The move removes federal restrictions that limited red-dye diesel—which carries no road tax—to specific off-road applications. Farmers and other buyers can now purchase it for any purpose without penalty.

At the signing, Trump took a shot at Biden: "Joe Biden couldn't sign... He only used auto pens. Look at that. Isn't that nice?"

The order could cut fuel costs for farmers and other diesel users, though it may reduce federal highway tax revenue.