Obama had previously said he learned of Clinton's exclusive use of private email while at the State Department "the same time everybody else learned it," after it was reported in the media.
"The President was aware of her (Clinton's) email address; he traded emails with her. That should not be a surprise, that the President of the US is going to trade emails with the secretary of state," White House spokesman Josh Earnest said.

"But the president was not aware of the fact that this was a personal email server, and that this was the email address she was using exclusively for all her business," he said.
The controversy over Clinton's use of private email address - for the entire four years she was serving as Secretary of State - broke out last week after news reports said that Clinton used a domain named "clintonemail.com" to create the email account on January 13, 2009, the same day she began the confirmation process in the Senate.
All US State Department officials are to use a "state.gov" email address for all official communications. Clinton, a top Democratic presidential contender for 2016, is likely to hold a news conference over the next few days to address the controversy.
She has so far has not commented on the controversy except for tweeting that she has asked the State Department to make these emails public.
The State Department has said that they are reviewing the emails, running into more than 55,000 pages, and would be made public once the review is complete.

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