The FBI's search of John Bolton's properties is reportedly part of an investigation into the handling of classified information.
The searches were carried out on Friday at his home in Bethesda, Maryland, and his office in Washington DC.
This development comes amid rising political tensions and is being widely interpreted as a move against a prominent critic of President Donald Trump.
Bolton, who served as Trump's National Security Advisor for 17 months, has been a vocal opponent of the president since his dismissal in 2019.
He published a tell-all book, 'The Room Where It Happened,' in 2020, which was highly critical of Trump's foreign policy decisions.
While the specific details of the current investigation are not yet public, sources have indicated that Bolton was not detained or charged with any crimes.
This story is of significant interest to a UK audience due to the long-standing special relationship between the UK and the US, and the global implications of US political developments and investigations.
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