The FBI spent a year investigating Clinton‘s use of a private email server, instead of government systems, while she was secretary of state from 2009 to 2013. Comey concluded in July that while Clinton and her staff had been „extremely careless“ in handling classified information there were no grounds for any charges.

But the issue resurfaced unexpectedly on Friday when Comey sent a brief letter to members of Congress to tell them the agency was looking at new emails.