John Bolton, US President Donald Trump's former national security adviser-turned-adversary, has been indicted by a federal grand jury in Maryland.

He now faces 18 charges: eight counts of transmission of national defence information and 10 counts of retention of national defence information.

Prosecutors wrote in the indictment that during the time he was national security adviser to Trump, Bolton shared "more than a thousand pages of information about his day-to-day activities" with two unauthorised individuals.

Both of those people were related to Bolton and didn't have the authority to access classified information, prosecutors said.

Print-outs of "diary" entries were also found in Bolton's home, according to the indictment.

Bolton is expected to surrender himself, as soon as

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