The Clinton campaign on Sunday called on the FBI to release more information about its renewed investigation into Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE's private email server from her time as secretary of State. 

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Clinton campaign chairman John Podesta called FBI Director Jim Comey's announcement about newly surfaced emails "unprecedented" and asked him to elaborate. 

"We're calling on Mr. Comey to come forward and explain what's at issue here," Podesta said on CNN's "State of the Union." 

"To throw this in the middle of the campaign, 11 days [before the election] just seemed to break with precedent and be inappropriate at this stage."

The FBI on Friday said it is assessing new emails "pertinent" to its investigation into Clinton's use of a private email server.

The emails were reportedly discovered when the FBI seized devices belong to longtime Clinton aide Huma Adedin and her estranged husband, former Rep. Anthony Weiner (D-N.Y.), who is under investigation for allegedly sending sexually explicit messages to an underage girl.

Comey has come under fire for making the announcement despite advice from top Department of Justice officials to not. 

Podesta agreed, saying on Sunday that Comey's comments seemed premature. 

"Is that something you toss on the table, or do you take the time to do what other prosecutors have done in the past?" Podesta asked.