Clinton is forwarded an email from her aide Jake Sullivan with the subject heading “Mr. Donilon’s Meeting.” This is a likely reference to National Security Advisor Thomas E. Donilon. Virtually all the text in the emails in this chain are later redacted. However, emails in the chain are CCed to over 30 US officials, including at least one who is a secret CIA official. (US Department of State, 1/7/2016)
One day after David Petraeus resigns as CIA director due to media reports that he had improperly handled classified information, Homeland Security Advisor John Brennan sends an email to National Security Advisor Thomas E. Donilon detailing the provisions for Petraeus’s personal security due to his unexpected resignation.
Donilon then forwards it to Clinton, commenting, “Madam Secretary – Attached is an update on the security for Dave P.”
All of Brennan’s email will later be redacted and classified at the “confidential” level on the grounds that it involves “vulnerabilities or capabilities of systems, installations, infrastructures, projects, plans, or protection services relating to the national security.” But another reason given for that classification is that it mentions the name of a secret CIA officer.