WASHINGTON — President Trump’s repeated calls to “nationalize” elections drew swift resistance from California officials this week, who said they are ready to fight should the federal government attempt to assert control over the state’s voting system.

“We would win that on Day One,” California Atty. Gen. Rob Bonta told The Times. “We would go into court and we would get a restraining order within hours, because the U.S. Constitution says that states predominantly determine the time, place and manner of elections, not the president.”

“We’re prepared to do whatever we have to do in California,” said California Secretary of State Shirley Weber, whose office recently fought off a Justice Department lawsuit demanding California’s voter rolls and other sensitive voter information.

Both Bonta and Weber said their offices are closely watching for any federal action that could affect voting in California, including efforts to seize election records, as the FBI recently did in Georgia, or target the counting of mailed ballots, which Trump has baselessly alleged are a major source of fraud.

Weber said California plays an outsized role in the nation and is “the place that people want to beat,” including through illegitimate court challenges to undermine the state’s vote after elections, but California has fought off such challenges in the past and is ready to do it again.

“There’s a cadre of attorneys that are already, that are always prepared during our elections to hit the courts to defend anything that we’re doing,” she said. “Our election teams, they do cross the T’s, dot the I’s. They are on it.”

“We have attorneys ready to be deployed wherever there’s an issue,” Bonta said, noting that his office is in touch with local election officials to ensure a rapid response if necessary.

The standoff reflects an extraordinary deterioration of trust and cooperation in elections that has existed between state and federal officials for generations — and follows a remarkable doubling down by Trump after his initial remarks about taking over the elections raised alarm.

Trump has long alleged, without evidence and despite multiple independent reviews concluding the opposite, that the 2020 election was stolen from him. He has alleged, again without evidence, that millions of fraudulent votes were cast, including by non-citizen voters, and that blue states looked the other way to gain political advantage.

Last week, the Justice Department acted on those claims by raiding the Fulton County, Ga., elections hub and seizing 2020 ballots. The department also has sued states, including California, for their voter rolls, and is defending a Trump executive order seeking to end mail voting and add new proof of citizenship requirements for registering to vote, which California and other states have sued to block.

On Monday, Trump further escalated his pressure campaign by saying on former FBI Deputy Director Dan Bongino’s podcast that Republicans should “take over the voting in at least 15 places,” alleging that voting irregularities in what he called “crooked states” are hurting his party. “The Republicans ought to nationalize the voting.”

On Tuesday morning, Karoline Leavitt, the White House press secretary, appeared to try to walk back Trump’s comments, saying he had been referring to the Save Act, a measure being pushed by Republicans in Congress to codify Trump’s proof-of-citizenship requirements. However, Trump doubled down later that day, telling reporters that if states “can’t count the votes legally and honestly, then somebody else should take over.”

Bonta said Trump’s comments were a serious escalation, not just bluster: “We always knew they were going to come after us on something, so this is just an affirmation of that — and maybe they are getting a step closer.”

Bonta said he will especially be monitoring races in the state’s swing congressional districts, which could play a role in determining control of Congress and therefore be a target of legal challenges.

“The strategy of going after California isn’t rational unless you’re going after a couple of congressional seats that you think will make a difference in the balance of power in the House,” Bonta said.

California Democrats in Congress have stressed that the state’s elections are safe and reliable, but also started to express unease about upcoming election interference by the administration.

Rep. Ro Khanna (D-Fremont) said on “Meet the Press” last week that he believes the administration will try to use “every tool in their toolbox to try and interfere,” but that the American people will “overcome it by having a battalion of lawyers at the polls.”

California Sen. Adam Schiff this week said recent actions by the Trump administration — including the Fulton County raid, where Director of National Intelligence Tulsi Gabbard put Trump on the phone with agents — were “wrong” and set off “alarm bells about their willingness to interfere in the next election.”

Democrats have called on their Republican colleagues to help push back against such interference.

“When he says that we should nationalize the elections and Republicans should take over, and you don’t make a peep? What is going on here?” Senate Minority Leader Chuck Schumer (D-N.Y.) said Tuesday. “This is the path that has ruined many a democracy, and our democracy is deep and strong, but it requires — and allows — resistance to these things. Verbal resistance, electoral resistance. Where are you?”

Some Republicans have voiced their disagreement with Trump. Senate Majority Leader John Thune (R-S.D.) said Tuesday that he is “supportive of only citizens voting and showing ID at polling places,” but is “not in favor of federalizing elections,” which he called “a constitutional issue.”

“I’m a big believer in decentralized and distributed power. And I think it’s harder to hack 50 election systems than it is to hack one,” he said.

However, other Republican leaders have commiserated with Trump over his qualms with state-run elections. House Majority Leader Mike Johnson (R-La.), for example, took aim at California’s system for counting mail-in ballots in the days following elections, questioning why such counting led to Republican leads in House races being “magically whittled away until their leads were lost.”

“It looks on its face to be fraudulent. Can I prove that? No, because it happened so far upstream,” Johnson said. “But we need more confidence in the American people in the election system.”

Elections experts expressed dismay over Johnson’s comments, calling them baseless and illogical. The fact that candidates who are leading in votes can fall behind as more votes are counted is not magic but math, they said — with Democrats agreeing.

“Speaker Johnson seems to be confused, so let me break it down. California’s elections are safe and secure. The point of an election is to make sure *every* eligible vote cast is counted, not to count fast,” Sen. Alex Padilla (D-Calif.) wrote on X. “We don’t just quit while we’re ahead. It’s called a democracy.”

Democrats have also expressed concern that the administration could use the U.S. Postal Service to interfere with counting mail-in ballots. They have specifically raised questions about a rule issued by the postal service last December that deems mail postmarked on the day it is processed by USPS, rather than the day it is received — which would impact mail-in ballots in places such as California, where ballots must be postmarked by election day to be counted.

“Election officials are already concerned and warning that this change could ultimately lead to higher mailed ballots being rejected,” Senate Democrats wrote to U.S. Postal Service Postmaster General David Steiner last month.

Some experts and state officials said voters should make a plan to vote early, and consider dropping their ballots in state ballot drop boxes or delivering them directly to voting centers.