Likely Democratic presidential candidate Hillary Rodham Clinton said Tuesday it would have been better if she had used a government email account and a separate mobile device as U.S. secretary of state, but said the vast majority of her correspondence went to employees using government addresses.

Clinton has come under fire for her use of a private email account for official business when she served as the top U.S. diplomat because of concerns about security and concerns that she shielded important facts about her tenure from the public.

"I saw it as a matter of convenience," Clinton told reporters during a press conference at the United Nations in New York in an effort to defuse the controversy over her use of a single mobile device and a private email account.