The case has caused palpable unease at the Fox News Channel, said several people there, who would speak only anonymously. Anchors and executives have been preparing for depositions and have been forced to hand over months of private emails and text messages to Dominion, which is hoping to prove that network employees knew that wild accusations of ballot rigging in the 2020 election were false. The hosts Steve Doocy, Dana Perino and Shepard Smith are among the current and former Fox personalities who either have been deposed or will be this month.

Dominion is trying to build a case that aims straight at the top of the Fox media empire and the Murdochs. In court filings and depositions, Dominion lawyers have laid out how they plan to show that senior Fox executives hatched a plan after the election to lure back viewers who had switched to rival hard-right networks, which were initially more sympathetic than Fox was to Mr. Trump’s voter-fraud claims.

Libel law doesn’t protect lies. But it does leave room for the media to cover newsworthy figures who tell them. And Fox is arguing, in part, that’s what shields it from liability. Asked about Dominion’s strategy to place the Murdochs front and center in the case, a Fox Corporation spokesman said it would be a “fruitless fishing expedition.” A spokeswoman for Fox News said it was “ridiculous” to claim, as Dominion does in the suit, that the network was chasing viewers from the far-right fringe.

Fox is expected to dispute Dominion’s estimated self-valuation of $1 billion and argue that $1.6 billion is an excessively high amount for damages, as it has in a similar defamation case filed by another voting machine company, Smartmatic.

A spokesman for Dominion declined to comment. In its initial complaint, the company’s lawyers wrote that “The truth matters,” adding, “Lies have consequences.”

denied a motion from Fox that would have excluded the parent Fox Corporation from the case — a much larger target than Fox News itself. That business encompasses the most profitable parts of the Murdoch American media portfolio and is run directly by Rupert Murdoch, 91, who serves as chairman, and his elder son, Lachlan, the chief executive.

Soon after, Fox replaced its outside legal team on the case and hired one of the country’s most prominent trial lawyers — a sign that executives believe that the chances the case is headed to trial have increased.

Dominion’s lawyers have focused some of their questioning in depositions on the decision-making hierarchy at Fox News, according to one person with direct knowledge of the case, showing a particular interest in what happened on election night inside the network in the hours after it projected Mr. Trump would lose Arizona. That call short-circuited the president’s plan to prematurely declare victory, enraging him and his loyalists and precipitating a temporary ratings crash for Fox.

These questions have had a singular focus, this person said: to place Lachlan Murdoch in the room when the decisions about election coverage were being made. This person added that while testimony so far suggests the younger Murdoch did not try to pressure anyone at Fox News to reverse the call — as Mr. Trump and his campaign aides demanded the network do — he did ask detailed questions about the process that Fox’s election analysts had used after the call became so contentious.

The case was settled in 2017.

But Fox has also been searching for evidence that could, in effect, prove the Dominion conspiracy theories weren’t really conspiracy theories. Behind the scenes, Fox’s lawyers have pursued documents that would support numerous unfounded claims about Dominion, including its supposed connections to Hugo Chávez, the Venezuelan dictator who died in 2013, and software features that were ostensibly designed to make vote manipulation easier.

According to court filings, the words and phrases that Fox has asked Dominion to search for in internal communications going back more than a decade include “Chavez” and “Hugo,” along with “tampered,” “backdoor,” “stolen” and “Trump.”

Eric Munchel of Tennessee, in which he is brandishing a shotgun, with Mr. Trump on a television in the background. The television is tuned to Fox Business.

But the hurdle Dominion must clear is whether it can persuade a jury to believe that people at Fox knew they were spreading lies.

“Disseminating ‘The Big Lie’ isn’t enough,” said RonNell Andersen Jones, a law professor and First Amendment scholar at the University of Utah’s S.J. Quinney College of Law. “It has to be a knowing lie.”

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Fox News Files to Dismiss Dominion’s Lawsuit Over 2020 Election Coverage

Fox News Media, the Rupert Murdoch-controlled cable group, filed a motion on Tuesday to dismiss a $1.6 billion defamation lawsuit brought against it in March by Dominion Voting Systems, an election technology company that accused Fox News of propagating lies that ruined its reputation after the 2020 presidential election.

The Dominion lawsuit, along with a similar defamation claim brought in February by another election company, Smartmatic, have been widely viewed as test cases in a growing legal effort to battle disinformation in the news media. And it is another byproduct of former President Donald J. Trump’s baseless attempts to undermine President Biden’s clear victory.

In a 61-page response filed in Delaware Superior Court, the Fox legal team argues that Dominion’s suit threatened the First Amendment powers of a news organization to chronicle and assess newsworthy claims in a high-stakes political contest.

“A free press must be able to report both sides of a story involving claims striking at the core of our democracy,” Fox says in the motion, “especially when those claims prompt numerous lawsuits, government investigations and election recounts.” The motion adds: “The American people deserved to know why President Trump refused to concede despite his apparent loss.”

Charles Babcock, who has a background in media law, and Scott Keller, a former chief counsel to Senator Ted Cruz, Republican of Texas. Fox has also filed to dismiss the Smartmatic suit; that defense is being led by Paul D. Clement, a former solicitor general under President George W. Bush.

“There are two sides to every story,” Mr. Babcock and Mr. Keller wrote in a statement on Tuesday. “The press must remain free to cover both sides, or there will be a free press no more.”

a novel tactic in the battle over disinformation, but proponents say the strategy has shown some early results. The conservative news outlet Newsmax apologized last month after a Dominion employee, in a separate legal case, accused the network of spreading baseless rumors about his role in the election. Fox Business canceled “Lou Dobbs Tonight” a day after Smartmatic sued Fox in February and named Mr. Dobbs as a co-defendant.

Jonah E. Bromwich contributed reporting.

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Dominion Sues Fox News, Claiming Defamation in Election Coverage

Fox News and its powerful owner, Rupert Murdoch, are facing a second major defamation suit over the network’s coverage of the 2020 presidential election, a new front in the growing legal battle over media disinformation and its consequences.

In the latest aftershock of Donald J. Trump’s attempt to undermine President Biden’s victory, Dominion Voting Systems, an election technology company that was at the center of a baseless pro-Trump conspiracy about rigged voting machines, sued Fox News on Friday for advancing lies that devastated its reputation and business.

Dominion, which has requested a jury trial, is seeking at least $1.6 billion in damages. The lawsuit comes less than two months after Smartmatic, another election tech company, filed a $2.7 billion lawsuit against Mr. Murdoch’s Fox Corporation and named the Fox anchors Maria Bartiromo, Lou Dobbs and Jeanine Pirro as defendants.

In a 139-page complaint filed in Delaware Superior Court, Dominion portrayed Fox as an active player in spreading falsehoods that the company had altered vote counts and manipulated its machines to benefit Mr. Biden in the election.

Mr. Giuliani and Ms. Powell for defamation. The company also sued Mike Lindell, the chief executive of MyPillow and a Trump ally who was also a frequent guest on Fox and other conservative media outlets. Each of those suits seeks damages of more than $1 billion.

“The truth matters,” Dominion’s lawyers wrote in Friday’s complaint against Fox. “Lies have consequences. Fox sold a false story of election fraud in order to serve its own commercial purposes, severely injuring Dominion in the process. If this case does not rise to the level of defamation by a broadcaster, then nothing does.”

In a statement on Friday, Fox said that its 2020 election coverage “stands in the highest tradition of American journalism” and pledged to “vigorously defend against this baseless lawsuit in court.”

Dominion’s filing on Friday represented what its lawyers called a new phase in its battle against its detractors, and Thomas A. Clare, part of the company’s legal team, said it was unlikely to be the last lawsuit filed. His firm, Clare Locke, has in recent weeks joined with the firm Susman Godfrey, which is known for taking cases to trial.

filed a motion to dismiss the Smartmatic lawsuit, arguing that the false claims of electoral fraud made on its channels were part of covering a fast-breaking story of significant public interest. “An attempt by a sitting president to challenge the result of an election is objectively newsworthy,” Fox wrote in the motion.

The narrative that Mr. Trump and his allies spun about Dominion was among the more baroque creations of a monthslong effort to cast doubt on the 2020 election results and convince Americans that Mr. Biden’s victory was not legitimate.

Dominion, founded in 2002, is one of the largest manufacturers of voting machine equipment in the United States; its equipment was used by election authorities in more than two dozen states last year, including several states carried by Mr. Trump.

Allies of Mr. Trump falsely portrayed Dominion as biased toward Mr. Biden and argued, without evidence, that it was tied to Hugo Chávez, the long-dead Venezuelan dictator. John Poulos, Dominion’s founder, and other employees received harassing and threatening messages from people convinced that the company had undermined the election results, according to the complaint.

Fox News and Fox Business programs were among the mass-media venues where Mr. Trump’s supporters denounced Dominion. The lawsuit also cites examples of Fox hosts, including Ms. Bartiromo and Ms. Dobbs, uncritically repeating or vouching for false claims made by Mr. Giuliani and Ms. Powell.

“Fox took a small flame and turned it into a forest fire,” Dominion wrote in the lawsuit. “As the dominant media company among those viewers dissatisfied with the election results, Fox gave these fictions a prominence they otherwise would never have achieved.”

faced a reckoning of sorts from the threat of defamation litigation, a relatively novel tactic in a battle against disinformation that had previously been limited to ad boycotts and liberal public pressure campaigns.

In February, two days after Smartmatic filed its suit, Fox Business canceled “Lou Dobbs Tonight,” its highest-rated program. Newsmax, a pro-Trump cable channel also facing potential legal action, cut off Mr. Lindell when he repeated falsehoods about rigged voting machines.

Taken together, Dominion and Smartmatic are demanding at least $4.3 billion in damages from Fox. Controlled by Mr. Murdoch, 90, and his elder son, Lachlan, the Fox Corporation reported that it had made $3 billion in pretax profit from September 2019 to September 2020, on revenue of $12.3 billion.

the network’s early projection that Mr. Biden would carry Arizona.

Dominion also makes the case that Fox and its hosts benefited from uncritically repeating these baseless claims. The suit cites a postelection rise in ratings for anchors like Ms. Bartiromo and Ms. Dobbs, and notes that the ex-husband of Ms. Pirro, who spoke on-air of a stolen election, later secured a pardon from Mr. Trump.

“Fox has had a problem because a lot of its pundits have said the very things that have led Dominion to bring this lawsuit,” the First Amendment lawyer Floyd Abrams said in an interview.

In its response to the Smartmatic suit, Fox argued that its reporting on the election should be viewed in its totality — pointing out that at least one host, Tucker Carlson, voiced skepticism about Ms. Powell’s statements — and that claims by the president’s lawyers in an election dispute were inherently newsworthy. “This lawsuit strikes at the heart of the news media’s First Amendment mission to inform on matters of public concern,” Fox wrote in that motion.

Mr. Zick, the First Amendment lawyer, said that Dominion had included an implicit response to that argument: “This isn’t neutral reportage. It’s disinformation for profit.”

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