A coalition of 24 Republican-led states, spearheaded by Nebraska Attorney General Mike Hilgers, has urged the U.S. Environmental Protection Agency (EPA) to block California's Advanced Clean Fleets regulation, which mandates a transition to electric trucks. The coalition argues that California is overstepping its authority and that such a mandate could disrupt national logistics, increase consumer prices, and burden the electric grid. They assert that California lacks the legal power to enforce its electric truck mandate beyond its borders and that granting a waiver would be unconstitutional. The regulation, stemming from a 2020 executive order, aims for all medium- and heavy-duty trucks in California to be zero-emission by 2045, with earlier deadlines for heavier vehicles. Critics, including Virginia Attorney General Jason Miyares, argue that California's actions could impose significant economic harm on other states and families across the U.S. This ongoing dispute raises questions about the balance of state and federal regulatory powers in addressing climate change.