The filing from Dominion Voting Systems is part of the voting technology firm's $1.6 billion defamation lawsuit against Fox News and its parent company over the cable news giant's coverage of the 2020 presidential election -- a case that's headed to trial in April.
Documents in the case show Murdoch and other Fox executives believed Joe Biden fairly beat Donald Trump and that the results were not in doubt.
Dominion has argued that internal communications and depositions by Fox personnel prove the network knowingly spread falsehoods about Trump's loss in order to boost ratings.
Fox has argued that its coverage of claims by Trump's lawyers were protected by the First Amendment of the U.S. Constitution.
Asked by a Dominion lawyer if some of Fox's commentators had endorsed the idea that the 2020 election was stolen, Murdoch responded, "Yes. They endorsed," according to the filing.
In a statement on Monday, a Fox spokesperson said Dominion's view of defamation law "would prevent journalists from basic reporting," accusing Dominion of "smearing" Fox for covering Trump's allegations.
Dominion's filing included emails and statements by Rupert Murdoch and other top Fox executives saying the claims made about Dominion on-air were false, part of the voting machine company's effort to prove the network either knew the statements it aired were false or recklessly disregarded their accuracy -- the standard of "actual malice" public figures must prove to win a defamation case.
