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WASHINGTON, D.C. (CBSMiami/AP) — Bill Clinton says it was a mistake for Hillary to maintain a personal email server even though her predecessors and her successor at the State Department did it.

But the former president says his wife should have known that there would be a different set of rules applied to her if she ran for the presidency.

Bill Clinton defended the Democratic nominee for president Friday during a question-and-answer period at a Las Vegas forum organized by the Asian American Journalists Association and APIA Vote.

Clinton says it didn’t occur to diplomats sending the emails at the time that they should be concerned with records classification.

The former president also says the email server shouldn’t be a cause for distrust, and that people in the national security community wouldn’t endorse Hillary Clinton’s candidacy if it was.

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