A California sheriff who is running as a Republican for governor has seized more than 650,000 ballots from last year’s election, escalating an ongoing conflict with state officials.

Chad Bianco, Riverside county’s sheriff, says he is carrying out an investigation into allegations that ballots were unlawfully cast in last year’s election that resulted in the passage of Proposition 50. The proposition redrew congressional districts to help gerrymander the state in favor of Democrats, in response to similar measures in Republican states like Texas.

Election officials and the California attorney general, Rob Bonta, have both dismissed those allegations. The discrepancy between the machine count and the final count submitted to the state is only 103 votes, according to the Riverside Record.

Bianco’s investigators obtained the ballots after serving the registrar of voters with search warrants last month, he said Friday at a press conference. A Riverside superior court judge appointed a special master to count the ballots, Bianco said.

“This investigation is simple: physically count the ballots and compare that result with the total votes recorded,” Bianco said.

Bianco has pushed the investigation for months, after a group called the Riverside Election Integrity Team, composed of local residents, contended that a discrepancy of 45,896 votes exists between the final vote count and handwritten records that tallied hand-counted ballots.

“There is no indication, anywhere in the United States, of widespread voter fraud,” Bonta said in a statement, according to the Los Angeles Times. “Counts, recounts, hand counts, audits, and court cases all support this.”

Bonta, a Democrat, called Bianco’s move unprecedented and says it is designed to sow distrust in elections.

Bianco is one of the two most prominent Republicans running in California’s crowded gubernatorial primary that includes more than half a dozen Democrats. California runs a top-two primary system that puts all candidates on the same ballot, regardless of party, and sends the two candidates who get the most voters on to the November general election.

Bonta has repeatedly sent letters to Bianco’s office over the last two months saying his staff is not qualified to conduct a recount. In one of the letters, Bonta wrote that the ballot seizure was “unacceptable” and “sets a dangerous precedent and will only sow distrust in our elections”.

California voters last year decisively passed the redistricting ballot initiative championed by Gavin Newsom, the state’s governor, in response to Donald Trump’s attempts to gerrymander new conservative seats in red states. California Republicans, joined by the Trump administration, challenged the measure, but the US supreme court denied an emergency petition to keep the new maps from moving forward.

The Associated Press contributed reporting

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