As California voters went to the polls Tuesday to cast their ballot on a measure that could block President Donald Trump's national agenda, state officials ridiculed his unsubstantiated claims that voting in the largely Democratic state is "rigged."

"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 Tuesday across California.

The president provided no evidence for his allegations.

"All 'Mail-In' Ballots, where the Republicans in that State are 'Shut Out,' is under very serious legal and criminal review," the GOP president wrote. "STAY TUNED!"

Gov. Gavin Newsom dismissed the president's claims on X as "the ramblings of an old man that knows he's about to LOSE."

His press office chimed in, too, calling Trump "a totally unserious person spreading false information in a desperate attempt to cope with his failures."

National tension is high as voters across California cast ballots on Proposition 50, a Democratic plan championed by Newsom to redraw the state's congressional districts ahead of the 2026 election to favor the Democratic Party. The measure is intended to offset GOP gerrymandering in red states after Trump pressed Texas to rejigger maps to shore up the GOP's narrow House majority.

California's top elections official, Secretary of State Shirley N. 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."

Weber noted that more than 7 million Californians have already voted and encouraged those who had yet to cast ballots to go to the polls.

"California voters will not be sidelined from exercising their constitutional right to vote and should not let anyone deter them from exercising that right," Weber said.

Of the 7 million Californians who have voted, more than 4.6 million have done so by mail, according to the secretary of state's office. Los Angeles residents alone have cast more than 788,000 mail-in ballots.

Trump has long criticized mail-in voting. As more Democrats opted to vote by mail in 2020 during the COVID-19 pandemic, the president repeatedly made unproven claims linking mail in voting with voter fraud. When Trump ultimately lost that election, he blamed expanded mail-in voting.

Over the last month, the stakes in the California special election have ratcheted up as polls indicate Proposition 50 could pass. More than half of likely California voters said they planned to support the measure, which could allow Democrats to gain up to five House seats.

Last month, the Justice Department appeared to single out California for particular national scrutiny: It announced it would send federal monitors to polling locations in counties in California as well as New Jersey, another traditionally Democratic state that is conducting nationally significant off-year elections.

The monitors are set to go to five California counties: Los Angeles, Kern, Riverside, Fresno and Orange.

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