WASHINGTON — FBI agents on Friday searched the home and office of John Bolton, President Donald Trump’s former national security adviser, a major escalation of a long-running inquiry into whether he collected or leaked sensitive national security information, law enforcement officials said.

A representative for the bureau said agents were “conducting court-authorized activity in the area” after agents wearing FBI jackets were seen entering Bolton’s house in the Maryland suburbs early Friday with empty document boxes. Other bureau officials were observed leaving his office in downtown Washington.

The sight of federal agents entering the home of a prominent Trump critic raises fresh concerns about the degree to which Trump is deploying government agencies, and the machinery of criminal jus

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