LOS ANGELES — Strong majorities of California voters believe American democracy is under attack and, in the wake of U.S. Supreme Court rulings narrowing federal protections, support enacting a new state Voting Rights Act to prohibit discrimination and efforts to suppress the ability to cast a ballot, a new poll showed.

The survey showed a sharp partisan divide over increasing voting rights protections, with Democrats and political independents overwhelmingly in favor and a majority of Republicans opposed. Fears that American democracy was either under attack, or at the very least being “tested,” were shared across political allegiances, according to a new poll released Thursday by the UC Berkeley Institute of Governmental Studies.

“I think that it suggests that the California voters, especially Democrats and independents, are very worried about some of what they’ve seen going on in Washington, both the court decisions and the Trump administration,” said Eric Schickler, the institute’s co-director. “They see it as threatening kind of core American values.”

That anxiety comes after years of baseless claims by President Donald Trump that the 2020 election was stolen from him, as well as Republican-led efforts to restrict the use of mail-in ballots and impose new requirements for voters to show identification and proof of citizenship.

Trump earlier this week signed an executive order to place new federal controls on voting by mail in states such as California, an action that Democrats called unconstitutional and vowed to challenge in court.

Schickler said Republican concerns about the fate of American democracy may stem in large part from allegations about voter fraud hyped by Trump and his supporters, including unfounded claims that droves of undocumented immigrants are swaying elections.

The survey found that 67% of California voters believe American democracy is under attack, including 84% of Democrats, 40% of Republicans and 64% of voters registered as “no party preference” or with other political parties. An almost equal number of Republicans, 38%, believed democracy was being “tested” but not under attack, compared with 13% of Democrats and 26% of independents. The remainder of those surveyed said American democracy is in no danger.

The partisan divide was more pronounced when voters were asked if they wanted California to enact its own Voting Rights Act after decisions by the Supreme Court limited federal protections against discrimination and unequal access to ballots, the poll found.

Overall, 66% of California registered voters backed adopting new state voter protections, with 88% of Democrats supporting new laws compared with 25% of Republicans and 66% of voters who are political independents or belong to other parties. Support for new state laws was strongest among Black voters — 72% — who historically have been targeted with discriminatory voting policies, including Jim Crow-era laws such as literacy tests and poll taxes.

The federal Voting Rights Act of 1965 banned those policies, ensuring that the right to vote cannot be denied because of race. The law also ensured that Black Americans and other communities of color had the opportunity to participate in all parts of the political system and elect the leaders of their choosing, influencing how political districts are drawn. The act was reauthorized by Congress in 2006 by an overwhelming bipartisan majority.

“Now it has come to the point where the president has tried to convince people that somehow equal voting rights is bad, because, in his words, ‘The wrong people are voting right,’” said Matt Barreto, faculty director of the UCLA Voting Rights Project, referring to Trump. “You have super majorities, very large percentages of Californians, who want the state to do more to protect voting rights, I think, because of the very tenuous climate right now, with the president constantly going after states for vote by mail and trying to get their voter rolls and these other sorts of things.”

Recent rulings by the conservative-leaning Supreme Court also have rolled back federal protections under the Voting Rights Act. A pending case, Louisiana vs. Callais, which involves the drawing of congressional districts, may overturn some of the remaining protections, Barreto said.

“I think people should be extremely nervous this court has not shown a lot of support for voting rights, and that’s the reason why California has an opportunity to pass its own state laws,” he said.

Among the laws California legislators could adopt, Barreto said, would be protections for early voting, banning onerous requirements on voters to prove citizenship and provide identification, and ensuring that congressional and other political districts are created to allow minority groups to elect representatives of their choice.

The Berkeley poll also found widespread support among California voters for requiring that the top three financial backers supporting and opposing ballot measures be listed in official ballot voter guides. A majority of Californians also supported expanding access to translation and interpreter assistance for populations that make up at least 5% or 5,000 voters in a county.

The Berkeley IGS poll surveyed 5,109 California registered voters online in English and Spanish from March 9 to 15. The results are estimated to have a margin of error of 2.5 percentage points in either direction in the overall sample, and larger numbers for subgroups.

Funding for the poll was provided to IGS by the Evelyn and Walter Haas, Jr. Fund, a private foundation based in San Francisco that aims to increase civic participation and improve the state’s democratic processes.