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Charles Krauthammer reacted to a Fox News report that a notorious Romanian hacker repeatedly breached Hillary Clinton's private email server when she was secretary of state.

He said that if what the hacker known as "Guccifer" says is true, it would be hugely damaging for Clinton, both politically and legally.

"It turns what would be hypothetical, theoretical, into something real," Krauthammer said. "It's one thing to say she jeopardized national security or could have...and thus is culpable.

"If it turns out that a guy in Romania, an individual...hacker was able to get in easily -- which means the Chinese, the Russians, the Iranians, all the others, have gone in -- that means there is real damage.

"At that point, apart from the legalities, it's hugely politically damaging."

Watch the commentary above.

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