Dominion Voting Systems filed a $1.6-billion defamation lawsuit against Fox News on Friday, arguing the cable news giant, in an effort to boost faltering ratings, falsely claimed that the voting company had rigged the 2020 election.

Dominion, in a copy of the lawsuit, argues that Fox News, which amplified inaccurate assertions that Dominion altered votes, "sold a false story of election fraud in order to serve its own commercial purposes, severely injuring Dominion in the process."

Though Dominion serves 28 states, it had been largely unknown outside the election community until the 2020 election. It is now widely targeted in conservative circles, in which millions of former U.S. President Donald Trump's supporters believe that Democrats nationwide conspired to steal votes from Trump.

Dominion's employees, from its software engineers to its founder, have been harassed. Some received death threats. And the company has suffered "enormous and irreparable economic harm," lawyers said.

One employee, Eric Coomer, told the AP he had to go into hiding over death threats because of the false claims. He has sued the Trump campaign, conservative media columnists and conservative media outlets Newsmax and One America News Network.

Even before Dominion's lawsuit on Friday, Fox News had already filed four motions to dismiss other legal action against its coverage. And anchor Eric Shawn interviewed a Dominion spokesperson on air in November.

"Fox News Media is proud of our 2020 election coverage, which stands in the highest tradition of American journalism, and we will vigorously defend against this baseless lawsuit in court," it said in a statement on Friday.

Democrats have said that there was no known widespread fraud in the 2020 election. Republican governors in Arizona and Georgia, key battleground states crucial to Joe Biden's victory, also vouched for the integrity of the elections in their states.

Nearly all the legal challenges from Trump and his allies were dismissed by judges, including two tossed by the Supreme Court, which has three Trump-nominated justices.

Still, some Fox News employees insisted that Dominion had changed votes through algorithms in its voting machines that had been created in Venezuela to rig elections for former Venezuelan President Hugo Chavez. On-air personalities brought on Trump allies Sidney Powell and Rudy Giuliani, who spread the claims, and then amplified those claims on Fox News' massive social media platforms.

Dominion said in the lawsuit that it tried repeatedly to set the record straight but was ignored by Fox News.

The company argues that Fox News, a network that features several pro-Trump personalities, pushed the false claims to explain away the former president's loss. The cable giant lost viewers after the election and was seen by Trump and some supporters as not being supportive enough of the Republican.

Attorneys for Dominion said Fox News' behavior differs greatly from that of other media outlets that reported on the claims.

"This was a conscious, knowing business decision to endorse and repeat and broadcast these lies in order to keep its viewership," said attorney Justin Nelson of Susman Godfrey.

Dominion has also sued Giuliani, Powell and the CEO of Minnesota-based MyPillow over the claims.

A rival technology company, Smartmatic USA, also sued Fox News over election claims for a similar sum of money. Unlike Dominion, Smartmatic's participation in the 2020 election was restricted to Los Angeles County.

The suit was filed in Delaware, where both companies are incorporated, though Fox News is headquartered in New York and Dominion is based in Denver.

(With input from AP)