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After Hillary Clinton's pneumonia diagnosis and the subsequent cancellation of several campaign events, the Democratic nominee's health has became an issue on the campaign trail.

Byron York, chief political correspondent for The Washington Examiner, said on "America's Newsroom" today that the problem is not merely that Clinton is having health concerns, but the secrecy surrounding them.

York noted that even David Axelrod, the chief strategist for Barack Obama's presidential campaigns, took to Twitter to call out Clinton's "unhealthy penchant for privacy."

"That's a major Democrat," York said. "It shows just how serious Hillary's transparency problem is."

York pointed out that Clinton has appeared unhealthy in recent weeks, with well-documented coughing fits, in addition to appearing "really, really tired."

"And then, finally, she collapses at the September 11 ceremony," York said, adding that the campaign tried to play it off before eventually acknowledging that she had pneumonia.

"They maintained that everything was fine, which does increase distrust and suspicion when people hear the Clinton campaign's pronouncements."

Watch Jennifer Griffin's report on Clinton's illness below, and let us know what you think in the comments.

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