Twitter whistleblower Peiter "Mudge" Zatko testified before the Senate Judiciary Committee on Tuesday.
It was his first public appearance since his bombshell allegations were reported last month by CNN and The Washington Post.
Zatko, who was previously the company's head of security, has alleged that Twitter has undisclosed security and privacy vulnerabilities, including that it may not be deleting the data of users who leave the platform as it is required to do. He has also said that Twitter may have foreign intelligence agents on the payroll.
Twitter responded to Zatko's testimony by reiterating a statement it made after his disclosure was initially made public.
"Today's hearing only confirms that Mr. Zatko's allegations are riddled with inconsistencies and inaccuracies," a Twitter spokesperson said in a statement to CNN.
The spokesperson added that the company's hiring process is independent of foreign influence and that access to internal company data is managed through measures such as background checks, access controls and monitoring systems.
Shortly after Zatko's testimony, Twitter shareholders voted in favor of Elon Musk's $44 billion takeover deal that Musk is now fighting to get out of.
