California Supreme Court halts Riverside sheriff's Prop 50 ballot probe

The court's stay is a win for Attorney General Rob Bonta, whose office argues the investigation is 'baseless' and illegal.

Apr. 8, 2026 at 7:39pm

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A solitary, dimly lit ballot box sits on a wooden table in an empty government office, the scene bathed in warm, diagonal sunlight and deep shadows, conveying a sense of quiet contemplation around the integrity of the electoral process.The California Supreme Court's intervention halts a controversial sheriff's investigation into a local ballot measure, underscoring the need for nonpartisan oversight of election processes.Riverside Today

The California Supreme Court has unanimously ordered Riverside County Sheriff Chad Bianco to halt his investigation into alleged voter fraud in last November's special election on Proposition 50. The court agreed to consider Attorney General Rob Bonta's argument that the investigation is illegal because it oversteps Bianco's legal authority as sheriff.

Why it matters

The high-profile investigation by the Republican sheriff, who is running for governor, has raised concerns about potential partisan interference in election processes. The court's intervention is seen as an important check on overreach by local law enforcement into matters typically handled by state election officials.

The details

Bianco's office had seized more than 650,000 ballots as part of the investigation, which was prompted by claims from a group called the 'Riverside Election Integrity Team' that alleged local election officials had not counted some 45,000 ballots in the Nov. 4 vote on Proposition 50. However, Riverside County election officials have said those tabulations were wrong and relied on unverified data.

  • On February and March 2026, Bianco's office seized more than 650,000 ballots as part of the investigation.
  • On April 8, 2026, the California Supreme Court ordered Bianco to halt the investigation.

The players

Chad Bianco

The Republican Riverside County Sheriff who is running for governor and launched the investigation into alleged voter fraud in the Proposition 50 election.

Rob Bonta

The California Attorney General whose office argued the sheriff's investigation is 'baseless' and illegal.

Riverside Election Integrity Team

A group that made claims of 45,000 uncounted ballots in the Proposition 50 election, prompting the sheriff's investigation.

Donald Trump

The former U.S. president who endorsed a different Republican, Steve Hilton, in the California governor's race.

Steve Hilton

The former Fox News host who is running for California governor and received an endorsement from Donald Trump.

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What they’re saying

“Today's decision by the California Supreme Court reins in the destabilizing actions of a rogue Sheriff, prohibiting him from continuing this investigation while our litigation continues.”

— Rob Bonta, California Attorney General

What’s next

The California Supreme Court will hear arguments from news outlets petitioning to unseal the warrant that allowed the sheriff's office to seize the ballots. The court will also consider Attorney General Bonta's argument that the sheriff's investigation is illegal.

The takeaway

The California Supreme Court's intervention in halting the Riverside sheriff's investigation into the Proposition 50 election highlights the importance of maintaining nonpartisan oversight of election processes and preventing local law enforcement from overstepping their authority, especially in high-stakes political races.