The audit, initiated by the GOP-led Arizona Senate in April, aims to review 2.1 million ballots from the 2020 presidential election cast in Maricopa County, which Joe Biden won.
"This is not the audit you want," Richer told CNN. "This is far from the gold standard of audits.
"You're looking for the Ernst & Young of accounting, or the Latham & Watkins of law firms. You're not looking for a newbie company who has never done this before."
He added that he had gotten little sense of what exactly Cyber Ninjas aimed to produce, beyond "some sort of report" that might come back in July or later.
He also said the audit wouldn't hold much weight with anyone other than "the 'stop the steal' crowd," referring to people who believe that the election was subject to mass voter fraud that prevented Donald Trump from winning.
"Let's be honest, this Arizona audit isn't going to convince anyone outside of the crowd that already believes the election was stolen," Richer told CNN.
Richer has been outspoken in his criticism of the audit. In May, he called Trump "unhinged" over his claims about the election.
"We think that the Arizona Senate boarded this train without knowledge of where it was going, and I don't think it's going to a good place," Richer said on Monday.
Cyber Ninjas did not immediately reply to Insider's request for comment.
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