BOMBSHELL: FBI reopening investigation of Hillary Clinton email server

"In connection with an unrelated case, the FBI has learned of the existence of emails that appear pertinent to the investigation," Comey wrote the chairmen. "I am writing to inform you that the investigative team briefed me on this yesterday, and I agreed that the FBI should take appropriate investigative steps designed to allow investigators to review these emails to determine whether they contain classified information, as well as to assess their importance to our investigation."

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Law enforcement sources say the newly discovered emails are not related to WikiLeaks or the Clinton Foundation. They would not describe in further detail the content of the emails. It's also unclear whether the emails in question are from Clinton herself.

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The surprising news jolts a presidential race that had largely settled as Republican presidential nominee Donald Trump struggled in national and key battleground polls. Now, Clinton will be placed back on the defensive and forced to confront yet again questions about her trustworthiness.