Hillary Clinton on Friday refused to apologise for using a private email account and server, but said she was sorry for causing confusion among the voters.
When asked whether she was sorry for exclusively using her private email account and server rather than a State Department email account while helming the agency, Clinton insisted she had done nothing wrong, Xinhua news agency reported.
"It was allowed and it was fully above board. The people in the government knew that I was using a personal account," Clinton said.
However, Clinton said it would have been better if she had two accounts and she took responsibility for her choice.
"I certainly wish that I had made a different choice and I know why the American people have questions about it," she said.
The controversy around Clinton's emailing practice burst into public view earlier August after the inspector general for the US intelligence community revealed that two of the thousands of emails held by Clinton contained top-secret information.
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On Friday, Clinton again insisted that she treated classified material seriously and had never exchanged emails that were marked classified through her private email system.
"We dealt with classified material on a totally different system," Clinton said, adding, "I dealt with it in person or on secure phone lines."