President Joe Biden’s administration, under pressure from labor unions and U.S. senators including from his home state of Delaware, is considering ways to provide relief to U.S. oil refiners from biofuel blending mandates, three sources familiar with the matter said. The issue pits two of the administration’s important political constituencies against each other: blue-collar refinery workers and farmers who depend on biofuel mandates to prop up a massive market for corn. It could prompt an about-face for the administration, which had been rolling back former President Donald Trump’s dramatic expansion of waivers for U.S. refiners from the Renewable Fuel Standard. The law requires them to blend billions of gallons of ethanol and other biofuels into their fuel each year or buy credits from those that do. The credits, known as RINs, are currently at their highest price in the program’s 13-year history, and refiners have said the policy threatens […]