California voters went to the polls Tuesday to decide on a radical redistricting plan with national implications, but the campaign is shaping up to be a referendum on President Trump.

Proposition 50, a ballot measure about redrawing the state’s congressional districts, was crafted by Democrats in response to Trump urging Texas and other GOP-majority states to modify their congressional maps to favor Republicans, a move that was designed to maintain Republican control of the U.S. House of Representatives.

Opponents have said Proposition 50 is a power grab by Democrats that would blatantly disenfranchise Republican voter

But supporters, fueled by a huge war chest in deep blue California, managed to make the vote about Trump and what they say are his efforts to erode democracy. The president has never been popular in California, but unprecedented months of immigration raids, tariffs and environmental rollbacks have only heightened the conflict.

“Trump is such a polarizing figure,” said Rick Hasen, a professor of law and political science at UCLA. “He commands great loyalty from one group of people and great animosity from others. ... It’s not surprising that this measure has been portrayed as sticking it to Donald Trump or (California Gov.) Gavin Newsom.”

A CNN exit poll of California voters found that about half said their vote on Prop. 50 was a way of opposing Trump.

Proposition 50 underscores how hyperpartisan California politics have become. A UC Berkeley poll last week conducted in conjunction with The Times found more than 9 out of 10 Democrats supported Proposition 50 and a similar proportion of Republicans opposed it.

California voters had been bombarded with television ads, mailers and social media posts for weeks about the high-stakes special election, so much so that only 2% of likely voters were undecided, according to the poll.

As if on cue, Trump weighed in on Proposition 50 on Tuesday morning just as voting was getting underway.

“The Unconstitutional Redistricting Vote in California is a GIANT SCAM in that the entire process, in particular the Voting itself, is RIGGED,” Trump said on Truth Social just minutes after polling stations opened across California.

The president provided no evidence for his allegations.

Newsom dismissed the president’s claims on X as “the ramblings of an old man that knows he’s about to LOSE.”

At a White House briefing Tuesday afternoon, White House Press Secretary Karoline Leavitt claimed, without providing examples, that California was receiving ballots in the name of undocumented immigrants who could not legally vote.

California’s top elections official, Secretary of State Shirley Weber, called Trump’s allegation “another baseless claim.”

“The bottom line is California elections have been validated by the courts,” Weber said in a statement. “California voters will not be deceived by someone who consistently makes desperate, unsubstantiated attempts to dissuade Americans from participating in our democracy.”

More than 6.3 million Californians — 28% of the state’s 23 million registered voters — had cast ballots as of Monday, according to a voting tracker run by Democratic redistricting expert Paul Mitchell. Ballots submitted by Democrats were outpacing votes by Republicans on Monday, though GOP voters were believed to be more likely to vote in person on Election Day.

Disabled Army veteran Micah Corpe, 50, had some choice words for Newsom outside a Twentynine Palms church that served as a polling place, calling the politician a “greasy used car salesman.”

Corpe, a Republican, described Proposition 50 as an effort by the governor to “do whatever he wants because he doesn’t like Trump.” At the same time, he said Texas’ decision to redraw its congressional districts was a necessity because of the influx of people moving there from California and other blue states.

“He fights (Trump) on everything,” Corpe said of Newsom. “Just give in a little to get a little. That’s all he’s got to do.”

Matt Lesenyie, an assistant professor of political science at Cal State Long Beach, said the seeds of Proposition 50 were sowed when it became clear that Republicans in Congress were not going to challenge Trump in an investigatory way or provide serious oversight.

“One of the benefits of our system is that there are checks designed in there and we haven’t exercised those checks in a good long time, so I think this is a Hail Mary for potentially doing that,” he said.

Bob Rowell, 72, said that in an ideal world Proposition 50 wouldn’t be necessary. But the Trump administration’s push to redraw lines in red states has created a “distinct danger of creating a never-ending Republican domination in Congress,” he said. So Rowell, a Green Party member, voted yes.

“I hope there’s some way to bring us back into balance,” he said.

Robert Hamilton, 35, an architectural drafter who lives in Twentynine Palms, sees Proposition 50 as a necessary step to push back on Trump’s policies, which he said are impinging on people’s rights. He’s proud of the role California is playing in this political moment.

“I think as a state we’re doing an excellent job of trying to push back against some of the more egregious oversteps of our liberties,” Hamilton said outside a church where he’d just cast his ballot in favor of the measure. “I do hope that if this measure is successful that other states will follow suit — not necessarily taking the same steps to redistrict but finding ways to at least hold the line while hopefully we get things sorted out.”

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(Times staff writers Seema Mehta and Katie King contributed to this report.)

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