Hillary Clinton's decision to use a private server while she led the State Department was "inconceivable," and everything she has said about the matter is "incoherent," according to a former chief of the National Security Agency.

"What she set up was inconceivable. And the explanations since that point are incoherent," retired Gen. Michael Hayden told Al Jazeera's Mehdi Hasan, in an interview set to air next week.

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Asked if it was likely that the Russian and Chinese governments had possession of her emails, Hayden replied "Yeah," and suggested it wasn't just them.

"I would lose respect for scores of intelligence organizations around the planet if they were not already thumbing through the emails," Hayden said. "And by the way, I would move heaven and Earth as the director of NSA to get the unclassified emails of several foreign ministers."

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However, he added, "Whether or not it represents a crime, I'll let the American justice system decide."