Twitter’s former head of security alleged that the company misled regulators about its poor cybersecurity defenses and its negligence in attempting to root out fake accounts that spread disinformation, according to a whistleblower complaint filed with U.S. officials, AP reported.

As per the report, this revelation could create serious legal and financial problems for the social media platform, which is currently attempting to force Tesla CEO Elon Musk to consummate his $44 billion offer to buy the company. Several members of Congress on Tuesday called on regulators to investigate the claims.

Peiter Zatko, who served as Twitter’s security chief until he was fired early this year, filed the complaints last month with the U.S. Securities and Exchange Commission, the Federal Trade Commission and the Department of Justice. The legal nonprofit Whistleblower Aid, which is working with Zatko, confirmed the authenticity of a redacted copy of the complaint posted online by the Washington Post.

“This was the last resort for him,” said John Tye, the group’s co-founder and chief disclosure officer, in an interview Tuesday. He said Zatko exhausted all attempts to get his concerns resolved inside the company before his firing in January.

Among Zatko’s most serious accusations are that Twitter violated the terms of a 2011 FTC settlement by falsely claiming that it had put stronger measures in place to protect the security and privacy of its users. Zatko also accuses the company of deceptions involving its handling of “spam” or fake accounts, an allegation that is at the core of Musk’s attempt to back out of the Twitter takeover.

Shares of Twitter Inc. closed down more than 7% on Tuesday.

Better known by his hacker handle “Mudge,” Zatko is a highly respected cybersecurity expert who first gained prominence in the 1990s and later worked in senior positions at the Pentagon’s Defense Advanced Research Agency and Google.

He joined Twitter at the urging of then-CEO Jack Dorsey in late 2020, the same year the company suffered an embarrassing security breach involving hackers who broke into the Twitter accounts of world leaders, celebrities and tech moguls, including Musk, in an attempt to scam their followers out of bitcoin.

Twitter said in a prepared statement Tuesday that Zatko was fired for “ineffective leadership and poor performance” and said the “allegations and opportunistic timing appear designed to capture attention and inflict harm on Twitter, its customers and its shareholders.” The company called his complaint “a false narrative” that is “riddled with inconsistencies and inaccuracies and lacks important context.”

Zatko’s attorneys, Debra Katz and Alexis Ronickher, said Twitter’s claim about his poor performance is false and that he repeatedly raised concerns about “grossly inadequate information security systems” with top executives and Twitter’s board of directors. The lawyers said that in late 2021, after the board was given “whitewashed” information about those security problems, Zatko escalated his concerns, “clashed” with CEO Parag Agrawal and board member Omid Kordestani and was fired two weeks later.

The 84-page complaint describes a broken corporate culture at Twitter that lacked effective leadership and where Zatko said top executives practiced “deliberate ignorance” of pressing problems. His description of Dorsey’s leadership style is particularly scathing; he described the Twitter founder as “extremely disengaged” during the last months of his tenure as CEO to the point where he would not even speak during meetings on complex issues facing the company.

Zatko said he heard from colleagues that Dorsey would remain silent for “days or weeks.” Dorsey announced he was stepping down as Twitter CEO in November 2021.

The disclosure says Twitter offered no monetary incentives for improving security and platform integrity, although the company did offer $10 million bonuses last year for top executives who could generate short-term user growth.

Among Zatko’s accusations of cybersecurity malpractice: Software and security updates were disabled on more than a third of employees’ computers -- unduly exposing them to malware -- and it was common for people to install “whatever software they wanted on their work systems.”

Whistleblower Aid said it is legally precluded from sharing Zatko’s statement. The same group worked with former Facebook employee Frances Haugen, who testified to Congress last year after leaking internal documents and accusing the social media giant of choosing profit over safety.

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