Senate Republicans Propose Resolutions to Repeal California's Landmark Vehicle Emissions Waivers

For decades, the vehicles Americans drive and the outdoor power equipment they purchase have been heavily influenced by a unique regulatory arrangement: a federal waiver system allowing California to set its own stringent emissions rules. Because automakers and equipment manufacturers generally prefer to build products to a single national standard rather than fragmenting their supply chains, California’s environmental regulations frequently become the de facto baseline for the entire United States. This system, rooted in the Clean Air Act of 1970, was designed to help the state combat severe local smog. Today, however, that foundational mechanism is facing its most comprehensive legislative challenge to date, as federal lawmakers attempt to retroactively dismantle the waivers that underpin the modern automotive regulatory landscape.[2]

On August 6, 2026, four Republican U.S. Senators—Eric Schmitt, Cynthia Lummis, Pete Ricketts, and Jon Husted—introduced four joint resolutions aimed at repealing a suite of Environmental Protection Agency (EPA) waivers previously granted to the California Air Resources Board (CARB). The targeted waivers include the foundational 2009 authorization that first allowed California to regulate greenhouse gas emissions from motor vehicles, as well as the Advanced Clean Cars I (ACC I) program and its 2022 reinstatement. Additionally, the resolutions target the Small Off-Road Engine (SORE) mandate, a rule that phases out the sale of gas-powered lawn equipment such as chainsaws, leaf blowers, and mowers in favor of zero-emission alternatives.[1]

The legislative mechanism driving this effort is the Congressional Review Act (CRA), a 1996 law that provides a streamlined process for Congress to overturn federal agency actions. Under normal circumstances, advancing legislation through the Senate requires a 60-vote supermajority to overcome a filibuster. The CRA, however, allows lawmakers to nullify an agency rule with a simple majority vote in both chambers. Crucially, if a CRA resolution is passed by Congress and signed by the president, it not only repeals the specific rule but also legally prohibits the agency from issuing any "substantially similar" regulation in the future unless explicitly authorized by new legislation.[3]

This current legislative push relies heavily on a precedent established during the previous year. In 2025, Congress successfully utilized the CRA to disapprove a separate batch of EPA waivers, including those for California’s Advanced Clean Cars II and Advanced Clean Trucks programs, which had mandated a complete phaseout of new gas-powered vehicle sales by 2035. Those resolutions were ultimately signed into law, establishing a novel legal interpretation that EPA waivers granted to a single state qualify as federal "rules" subject to congressional review. The August 2026 resolutions seek to expand that precedent by applying the CRA retroactively to waivers that were granted over a decade ago and have already been fully integrated into industry production cycles.[3]

Proponents of the repeal argue that the waiver system has been stretched far beyond its original statutory intent, allowing an unelected state board to dictate manufacturing standards and consumer choices for the rest of the country. Senator Schmitt and his colleagues contend that California’s regulations impose significant compliance costs on manufacturers, which are inevitably passed down to consumers nationwide in the form of higher vehicle and equipment prices. By utilizing the CRA, these lawmakers assert they are reclaiming congressional authority over interstate commerce and ensuring that national environmental and industrial policy is set by federal legislators rather than state-level regulators in Sacramento.[1]

Conversely, environmental advocates and state officials argue that retroactively repealing these waivers threatens both public health initiatives and market stability. The Union of Concerned Scientists has pointed out that standards like the 2009 greenhouse gas rules and the ACC I program have been fully implemented for years. Automakers have already invested billions of dollars into research, development, and factory retooling to meet these specific benchmarks. Stripping away the underlying legal authority for these standards now, advocates argue, would not only increase tailpipe pollution but also inject massive regulatory uncertainty into an industry that relies on long-term planning horizons.[4]

The classification of EPA waivers as "rules" under the CRA remains a subject of intense legal dispute. Historically, the EPA treated Section 209 waivers as localized adjudications rather than broad federal rulemakings, exempting them from the CRA’s reporting requirements. However, in June 2026, the EPA formally transmitted these older waivers to Congress, officially starting the legislative clock for a CRA challenge. In response, California filed lawsuits in federal district court, arguing that the EPA’s transmission of the waivers was unlawful and that the CRA cannot be used to revoke state-specific authorizations. The outcome of this litigation could fundamentally alter the balance of power between federal agencies and state environmental regulators.[3][5]

For the automotive and power equipment industries, the immediate future is characterized by overlapping jurisdictions and competing mandates. If the Senate passes these resolutions and they are signed into law, California and the numerous other states that automatically adopt its standards would lose the authority to enforce their current emissions caps. Manufacturers would theoretically only need to comply with baseline federal standards. However, until the federal courts issue a final ruling on the legality of using the CRA against EPA waivers, companies must navigate a fractured landscape, balancing the risk of non-compliance in California against the shifting political winds in Washington.[4]