In April, the U.S. EPA and National Highway Traffic Safety Administration’s separately announced proposed rulemakings to repeal the previous administration’s light-duty motor vehicle regulations that were part of the “The Safer Affordable Fuel-Efficient Vehicles Rule Part One: One National Program” (SAFE 1). The Trump Administration in SAFE-1 adopted rules that preempted states from regulating greenhouse gas emissions from new vehicles and from imposing zero emission vehicle sales mandates, reasoning that these regulations were preempted because they “related to” fuel economy. EPA in turn revoked California’s wavier to implement greenhouse gas emission standards in part because they conflicted with NHTSA’s fuel economy rules and because EPA believed California did need the standards to “meet compelling and extraordinary conditions.”