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A former Twitter security executive sued Elon Musk and X Corp. yesterday, alleging that he was unlawfully fired for objecting to steep budget cuts implemented shortly after Musk bought the social network.

Alan Rosa, who was fired on December 6, 2022, “was Head of Global Information Technology and Information Security and worked remotely for Twitter performing the majority of his job duties from his home in New Jersey,” said the lawsuit filed in US District Court for the District of New Jersey. He also sometimes worked in Twitter’s New York and California offices.

Rosa was required to resolve his claims through arbitration and says that he filed a demand for arbitration in April 2023 and paid his arbitration filing fee. Rosa alleges that “Twitter has refused to pay its portion of the arbitration fees despite being ordered by JAMS [Judicial Arbitration and Mediation Services] to do so.”