But because opening the refuge was included in the 2017 tax bill, Congress must also be involved in undoing it. “Without Congress’s help, I think there’s less flexibility for a Biden administration to stop the project,” said Laura Bloomer, a fellow at Harvard’s Environmental and Energy Law Program, who has been tracking regulatory rollbacks. “But there’s enormous flexibility for a Biden administration to change how they do it,” she added, noting that they could apply more environmentally rigorous standards that might make drilling there even less appealing. (Industry experts say it remains to be seen just how appealing it will be, given the price of oil, and the technical challenges of drilling there).