The FBI is searching the home of Donald Trump's former national security advisor John Bolton as part of an investigation into the handling of classified documents, an Associated Press source says.

Mr Bolton served in the US president's first administration as national security adviser but later became critical of Mr Trump.

The AP source was not authorised to discuss the investigation by name and spoke on the condition of anonymity.

Mr Bolton was not detained and has not been charged with any crimes, the person said.

Messages left by AP with a spokesperson for Mr Bolton and the White House were not immediately returned.

A lawyer who has represented Mr Bolton had no immediate comment on Friday, local time. Loading

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