Hillary Clinton's presidential campaign team has challenged the FBI over its decision to brief US lawmakers on a new inquiry into the Democratic candidate's email use.
FBI Director James Comey informed Congress of the move in a letter on Friday, 11 days before the election.
Mrs Clinton told supporters the move was "unprecedented" and "deeply troubling".
But Republican opponent Donald Trump has praised the bureau's decision.
In his letter to Congress, Mr Comey said the FBI had learned of fresh emails which might be "pertinent" to its previous inquiry into the Democratic candidate's use of a private server when she was secretary of state in the Obama administration.
Mr Comey has defended the move, insisting that not making it public would be "misleading" and also risked being "misunderstood", given that the FBI does not know the significance of the newly found emails.
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Speaking to supporters in Florida on Saturday, Mrs Clinton said: "It's not just strange, it's unprecedented. And it is deeply troubling because voters deserve to get full and complete facts.