A September 2016 FBI report will mention that the FBI determined “hundreds of emails” were sent by Clinton’s deputy chief of staff Huma Abedin and other State Department staffers to a member of Bill Clinton’s staff so he could print them out for Clinton. His name will be redacted, but he is almost certainly Oscar Flores, because the report will mention that he is a member of the US Navy Reserves, which Flores is at the time.
Some of these emails will later be determined to contain information classified at the “confidential” level, including six email chains forwarded by Abedin and one email chain forwarded by Clinton.
But the FBI will determine that Flores received a security clearance at the “secret” level on October 25, 2007 from the Defense Department. Furthermore, although Flores retires from the US Navy Reserves in September 2010, there is no indication his security clearance is deactivated at that time. (Federal Bureau of Investigation, 9/2/2016)