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Trait 5
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Jan 6, 2026 The Trump administration sued California cities over local natural-gas restrictions Tier 1 · Primary Institutions and Governance
The lawsuit challenged local policymaking authority and tested the boundary between federal preemption and municipal self-government.
Supporting reports
- Trump administration sues California cities over natural gas restrictions — The Trump administration filed a lawsuit against the California cities of Morgan Hill and Petaluma, challenging local ordinances that restrict natural gas infrastructure and appliances in new construction.
Jun 20, 2025 The Supreme Court allowed a challenge to California's vehicle emission waiver to proceed Tier 1 · Primary Institutions and Governance
The decision reopened litigation over a long-standing state regulatory power, affecting the balance between federal and state environmental authority.
Supporting reports
- Supreme Court Allows Challenge to California's Emission Limits — The U.S.
- Supreme Court releases opinion in Diamond Alternative Energy, LLC v. EPA (24-7) — The Supreme Court released an official slip opinion in Diamond Alternative Energy, LLC v.
May 29, 2025 The Supreme Court issued its opinion in Seven County Infrastructure Coalition v. Eagle County Tier 1 · Primary Institutions and Governance
The opinion set binding national law on environmental review and agency obligations, affecting future federal project approvals.
Supporting reports
- Supreme Court releases opinion in Seven County Infrastructure Coalition v. Eagle County (23-975) — The Supreme Court released an official slip opinion in Seven County Infrastructure Coalition v.
- US Supreme Court Ruling on Utah Railway Project — On May 29, 2025, the US Supreme Court issued an 8-0 ruling in favor of a multibillion-dollar oil railway expansion project in Utah, overturning a lower court's decision that had halted the project.
Apr 29, 2025 The Trump administration sued Michigan and Hawaii to block planned climate litigation against oil companies Corroborated Institutions and Governance
The lawsuits used federal courts to preempt state legal strategies, intensifying conflict over state and federal institutional authority.
Supporting reports
- Trump Administration Sues Michigan and Hawaii Over Climate Laws — The Trump administration sued Michigan and Hawaii to stop them from filing lawsuits against major oil companies for their role in the climate crisis.
- Trump Administration Sues States Over Climate Lawsuits — The Trump administration sued Michigan and Hawaii to prevent them from filing lawsuits against major oil companies for their role in the climate crisis.
- DoJ Sues States to Block Climate Litigation Against Oil Companies — The U.S.