WASHINGTON — John R. Bolton, the national security hawk and former adviser to President Donald Trump who became one of his most outspoken critics, was indicted by a federal grand jury in Maryland on Thursday on charges of mishandling classified information.

An 18-count indictment accused Bolton of using personal email and a messaging app to share more than 1,000 pages of “diary” notes about his day-to-day activities as Trump’s national security adviser in 2018 and 2019. Many of those notes included “national defense information,” including details classified as top secret, the indictment charged.

Trump and his former aide parted bitterly toward the end of his first term. “He’s a bad guy,” Trump said in answer to a question from a reporter at the White House about Bolton. “That’s the way

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