In response to Freedom of Information Act requests, State searched the roughly 30,000 messages Clinton turned over to her former agency at its request in December 2014 after officials searching for Benghazi-related records realized she had used a personal email account during her four-year tenure as secretary.
State later searched tens of thousands of emails handed over to the agency by three former top aides to Clinton: Huma Abedin, Cheryl Mills and Jake Sullivan. Finally, State searched a collection of emails the FBI assembled when it was investigating Clinton's use of the private account and server.
In all, State found 348 Benghazi-related messages or documents that were sent to or from Clinton in a period of nearly five months after the attack.
However, the conservative watchdog group Judicial Watch argued that the search wasn't good enough because State never tried to search its own systems for relevant messages in the official email accounts of Clinton's top aides.