After Mr. Priestap’s departure, none of the high-ranking bureau officials involved in the two investigations will remain with the bureau. FBI director James Comeywas fired by President Trump last year, and Deputy Director Andrew McCabewas later dismissed by then-Attorney General Jeff Sessions over his contacts with the media, days before he was eligible to retire with benefits.
Peter Strzok, the chief of the counterespionage section, left the FBI this year after it emerged that he had sent disparaging text messages about Mr. Trump.
Top bureau officials, especially those with national security experience, are in high demand in private-sector fields like cybersecurity, defense contracting and private intelligence. Mr. Priestap’s future plans aren’t known.
Documents and congressional testimony show that Mr. Priestap was in the inner circle of FBI decision makers for both investigations. According to emails released by Congress, Mr. Priestap helped Mr. Comey edit a 2016 public statement on the investigation into Mrs. Clinton, who didn’t face charges, though Mr. Comey said she had been careless with classified material.