WASHINGTON (Sputnik) — Toner noted he was unaware whether Tillerson has personal email address in addition to his official one.
"He [Tillerson] only uses Department of State email address for the conduct of official business," Toner told reporters. "Similarly, he only uses official phone number for conversations."
Tillerson, whose middle name is Wayne, reportedly called himself "Wayne Tracker."
The Federal Bureau of Investigation conducted a criminal investigation of Tillerson's predecessor, Hillary Clinton, on whether she intended to violate US laws by using a private email server and electronic devices for official business during her tenure as secretary of state from 2009-2013.