Bolton arrives in court to face charges of mishandling classified documents

John Bolton, Donald Trump's former national security adviser, has arrived at a federal court to face charges of mishandling classified information.

The 18 charges stem from allegations he shared or retained sensitive materials, including some characterised as top secret.

Bolton served during Trump's first administration but parted with the White House contentiously, and has become one of the president's most vocal public critics.

The indictment makes Bolton, 76, the third of the US president's political opponents to face charges in recent weeks. He could face decades in prison.

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