Former U.S. Secretary of State Hillary Clinton arrives for a press encounter after attending the annual Women's Empowerment Principles event at the UN headquarters in New York on March 10, 2015. Hillary Rodham Clinton, a potential 2016 U.S. presidential contender, on Tuesday defended her use of personal email account for official communications, saying it was "for convenience" and "allowed". (Xinhua/Niu Xiaolei)
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