NEW YORK (AP) — An FBI agent who publicly accused the agency of a pro-Trump bias has been arrested and charged with disclosing confidential records after authorities say he included sensitive material about investigations and informants into a draft of his memoir.

Johnathan Buma, who claimed in 2023 that the FBI went after President Joe Biden’s son Hunter while stifling his own investigation of President Donald Trump’s ally Rudy Giuliani, was arrested Monday evening at Kennedy Airport in New York as he was about to board a flight out of the country, authorities said.

In the book draft, Buma described himself as “the most significant whistleblower in FBI history.”

Federal prosecutors in California, where Buma had worked as a counterintelligence and counterproliferation agent, charged him on Tuesday with a single count of disclosure of confidential information. The charge is punishable by up to one year in prison.

Buma submitted a letter of resignation Sunday, according to an affidavit prepared by an FBI agent involved in the investigation. The probe into Buma’s conduct began well before Trump took office for his second term. The FBI searched Buma’s home in November 2023, when Biden was in office.