An FBI agent who claimed former New York Mayor Rudy Giuliani might have been “compromised” by Russian intelligence agents while working in the first Trump administration was arrested Monday on charges related to the alleged unauthorized disclosure of confidential information.

Johnathan Buma, a 15-year veteran of the bureau, allegedly shared text messages, internal documents, and other sensitive information with associates, including as part of a prospective book he began writing about his career as an FBI agent, ABC News reported Wednesday.

Federal agents arrested Buma on Monday at a departure gate at John F. Kennedy International Airport in New York as he was about to board an international flight, ABC News reported, citing court documents. He appeared in Brooklyn federal court for a preliminary hearing Tuesday, did not enter a plea, and was released from detention. His attorney did not immediately respond to a request for comment from ABC News.

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