By Sheila Dang
Sept 13 (Reuters) - A former Twitter Inc TWTR.N executive turned whistleblower is set to testify on Tuesday before a U.S. Senate committee about his claims of serious security lapses at the social media network.
A deadline for Twitter shareholders to vote on Elon Musk's deal to buy the company also falls on Tuesday.
The testimony of Peiter "Mudge" Zatko, a famed hacker who served as Twitter's head of security until his firing last year, comes as Twitter and Musk head to trial next month over whether the $44 billion deal should be completed.
The San Francisco-based company sued Musk for terminating the agreement, while the Tesla chief executive countersued, accusing Twitter of misrepresenting the number of false and spam accounts on its service.
A Delaware judge ruled last week that Musk may include Zatko's whistleblower claims in his case against Twitter, but denied his request to delay the trial.
On Tuesday, the Senate Judiciary Committee is expected to question Zatko on his claims that Twitter misled regulators about its compliance with a 2011 settlement with the Federal Trade Commission over improper handling of user data.
Since then, Twitter has made "little meaningful progress on basic security, integrity and privacy systems," Zatko's complaint filed with regulators in July said.
The committee, chaired by U.S. Senator Dick Durban, is also expected to press Zatko on his allegation that one or more of Twitter's employees worked on behalf of foreign...
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