U.S. President Donald Trump's national security adviser has never used his personal email account to send classified material, the White House said, following a report that Mike Waltz and other National Security Council members used Gmail for government work.

He has never sent classified material over his personal email account or any unsecured platform,” the spokesperson insisted.

Waltz and at least one senior aide used the commercial email service to discuss sensitive government matters, The Washington Post reported.

National Security Advisor Mike Waltz is under fire again, this time for using her personal Gmail. What does this mean about the security of your account?

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According to three officials who spoke to the Washington Post, members of President Trump's National Security Council, including Waltz, have conducted government business over personal Gmail accounts.

Mike Waltz's email usage has drawn ire from social media users after it was reported that the Trump administration cabinet member discussed government business on the accounts.