Dominion Voting Systems Inc has filed a lawsuit against former US president Donald Trump’s lawyer Rudy Giuliani, accusing him of defamation for making false claims of fraud about the November 2020 US presidential election, court documents indicate.

Dominion earlier filed lawsuits against the Trump campaign and former Trump campaign lawyer Sidney Powell, whom the company also accused of spreading false conspiracy theories about the election that Mr Trump lost to Joe Biden.

Mr Giuliani’s lawyer, Robert Costello, did not immediately respond to a request for comment.

Dominion is seeking $US1.3 billion ($1.7 billion) in damages from the former New York City mayor, alleging in the lawsuit that “he and his allies manufactured and disseminated the ‘Big Lie,’ which foreseeably went viral and deceived millions of people into believing that Dominion had stolen their votes and fixed the election.”

Dominion said it filed the lawsuit “to set the record straight” and to “stand up for itself, its employees and the electoral process”.

A group of prominent lawyers last week asked New York’s judiciary to suspend Mr Giuliani’s law licence because he allegedly made false claims in post-election lawsuits and urged Mr Trump’s supporters to engage in “trial by combat” shortly before they stormed the US Capitol on January 6.