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Secretary of Defense Ashton Carter used his personal email for work-related business, joining former Secretary of State Hillary Clinton as the second member of Obama's cabinet to do so.

Carter used his personal email account for official business for the few months he served as secretary of defense earlier this year, as first reported by the New York Times.

"After reviewing his email practices earlier this year, the secretary believes that his previous, occasional use of personal email for work-related business, even for routine administrative issues and backed up to his official account, was a mistake. As a result, he stopped such use of his personal email and further limited his use of email altogether," Pentagon press secretary Peter Cook said in a statement Wednesday night.

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