The Supreme Court Cleared Trump's Mail-In Voting Restrictions. California Is Fighting Back.

On August 24, the U.S. Supreme Court ruled six-to-three to let the Trump administration begin enforcing a March executive order that imposes new restrictions on mail-in voting. The decision could affect both how mail-in ballots are designed and who qualifies to receive one. Three days later, California announced it is co-leading a coalition of 24 state attorneys general in a lawsuit to block the order. A separate court order still pauses part of Trump's plan, so the executive order is only partially in effect — and legally contested — as the November 3, 2026 general election approaches.

The stakes for California are concrete. Since 2021, state law has required that a ballot be automatically mailed to every registered voter. More than 80 percent of Californians cast a mail-in ballot in 2024. In Santa Clara County, registrar Moreles reported that over 90 percent of voters in his jurisdiction use mail-in ballots. His county processed more mail-in ballots in the last general election than the entire state of Texas, which accepted roughly 342,000 mail-in votes while Santa Clara County sent out more than a million. California's rules also differ sharply from what the executive order may impose: all mailed ballots are valid so long as they are postmarked by election day and received no later than seven days after, and state law requires certification of elections within 30 days.

The legal fight is matched by a political one. California Governor Gavin Newsom said in a statement accompanying the lawsuit that "Donald Trump does not run elections, states do." In an earlier statement from April, Newsom said the administration's election action "would undoubtedly be overturned in court" and that "voting is the province of the states," adding that "the federal government does not dictate voting laws." He also accused Trump of "trying to rig the midterms by suppressing the vote through unconstitutional means." California House Democrats have separately urged election officials across the country to prepare for the possibility that Trump and his administration would seize ballots during the 2026 midterms.

Local elections administrators across California have been preparing for threats they once considered unthinkable, as reported by the Los Angeles Times in February 2026. The preparation spans both physical and informational security. The California Secretary of State operates an Office of Election Cybersecurity whose Communications Department develops election information-correction campaigns, improves outreach to rural and urban communities, and assists counties. Through the VoteSure initiative, voters can report suspicious election-related content for investigation. The Secretary of State's Mid-Year Voter Engagement and Impact Report lists combatting misinformation and disinformation as a core outreach goal, alongside multi-media voter awareness campaigns and outreach events. These programs build on infrastructure created during a 2020 statewide voter education campaign launched amid what the office described as "a barrage of misinformation and attacks on the integrity of elections approaching the 2020 General Election."

California's voter access infrastructure is expansive. The state's online voter registration application is available in ten languages: English, Spanish, Chinese, Hindi, Japanese, Khmer, Korean, Tagalog, Thai, and Vietnamese. Eligible 16- and 17-year-olds can pre-register, with activation at 18. Same Day Voter Registration, known in state law as Conditional Voter Registration, serves as a safety net for those who miss the standard registration deadline. VoteCal, the centralized voter registration database, allows voters to register, update records, find polling places, and check whether their vote-by-mail or provisional ballot was counted — and if not, why. Military and overseas voters can request, receive, and return ballots using a signed Military and Overseas Voter Return Envelope. Participants in the Safe At Home confidential address program receive guidance on registration through toll-free contact. The state also provides a "Voting Rights Restored" tool for individuals with prior felony convictions to check eligibility, and California Elections Code requires that individuals with disabilities under conservatorship be permitted to register unless otherwise disqualified, with reasonable accommodations available for those needing assistance to complete registration affidavits.

The 2026 election cycle is already in motion. The Official Voter Information Guide for the November 3, 2026 General Election was available for public examination until August 10, 2026. The Secretary of State's 2026 Ballot Bowl outreach program officially launched on August 20, with campuses invited to submit Statements of Interest. The Voter Hotline at (800) 345-8683 is staffed to assist voters. The Voter's Choice Act Outreach Program continues its work raising awareness about voting options. Political parties, voter registration drive coordinators, petition management companies, circulators, and volunteers operate under guidelines detailed in the Secretary of State's Guide to Voter Registration Drives, and the National Voter Registration Act framework covers voter roll maintenance and registration access through the Department of Motor Vehicles and designated NVRA agencies.

The broader context here is a collision between two fundamentally different visions of who should run elections. California has spent five years building a vote-by-mail-first system, supported by multilingual access, cybersecurity infrastructure, and misinformation response capacity. The Trump administration's executive order, now partially cleared for implementation by the Supreme Court, would impose federal constraints on a domain states have historically controlled. The 24-state coalition argues this is a constitutional overreach; the six-justice majority allowed implementation to proceed. Whether the remaining court order pausing part of the plan holds, and whether the new lawsuit succeeds before November 3, will shape not just how Californians vote in 2026 but whether the federal government can set parameters for mail-in voting nationwide. Local administrators are not waiting for a definitive ruling. They are preparing for disruptions across legal, logistical, and informational fronts simultaneously.