The Department of Justice (DOJ) has initiated an investigation into former National Security Advisor John Bolton, with the Federal Bureau of Investigation (F.B.I.) obtaining a search warrant related to overseas intelligence operations. The specific nature of the intelligence gathered abroad remains undisclosed, but the warrant was secured after the F.B.I. presented evidence to a federal judge. This marks the latest development in a series of legal actions against Bolton, who has faced scrutiny over his actions during the Trump administration.