"The investigation into President Trump’s former national security adviser, John R. Bolton, began to pick up momentum during the Biden administration..."

"... when U.S. intelligence officials collected information that appeared to show that he had mishandled classified information, according to people familiar with the inquiry. The United States gathered data from an adversarial country’s spy service, including emails with sensitive information that Mr. Bolton, while still working in the first Trump administration, appeared to have sent to people close to him on an unclassified system, the people said, speaking on the condition of anonymity to discuss a sensitive case that remains open. While those searches have raised fresh questions about the extent to which Mr. Trump may be using the Justice Department and F.B.I. to try to punish those he dislikes, the new details of the case present a more complex chain of events. The disclosures suggest that a long-running investigation into Mr. Bolton’s activities changed over time, with some of the issues echoing past inquiries into the handling of national security secrets...."

From "John Bolton Inquiry Eyes Emails Obtained by Foreign Government/It is not clear what country intercepted Mr. Bolton’s private emails, but the investigation into President Trump’s former national security adviser picked up momentum under the Biden administration" (NYT).