Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE's campaign manager, Robby Mook, on Sunday defended the Democratic presidential nominee after FBI Director James Comey sent a letter to lawmakers telling them the agency had found new emails "pertinent" to its investigation into Clinton's private server from her time as secretary of State.

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"What we're concerned and disturbed by is that Director Comey sent a letter saying we have some information. I don't know if it's significant; I don't know if it isn't," Mook said on "Fox News Sunday."
 
Mook said Comey didn't say if the emails found were sent or received by the Democratic nominee. Another hypothetical situation is that the emails are duplicates that have already been released, Mook said.
 
"We need all the information," Mook said, adding the FBI director needs to get it out quickly. 
 
"That's what we're asking," he continued. "Just get all of it out there and the voters can judge for themselves."
 
He said the campaign recognizes the FBI director was under "tremendous pressure" from Republican presidential nominee Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE and GOP leaders.
 
He added voters want to hear the candidates address the issues facing this country. 
 
Mook said the Democratic nominee has said her use of the private server was a mistake and made clear that Clinton cooperated fully with the investigation.
 
"We don't know anything, and this close to an election. This unprecedented announcement of new information when it's been reported ... that the FBI may have not even seen it, that Director Comey sent this unprecedented letter shortly before the election when he doesn't even know what the information is," Mook said.
 
"That's disturbing, and we're just asking him, get everything out there that he knows."
 
Host Chris Wallace pressed Mook over whether Clinton has discussed the newly discovered emails with Huma Abedin, a top aide.
 
"There is someone who knows what's in all those emails and that is Huma Abedin," said Wallace.
 
After Comey sent a letter to lawmakers on Friday, The New York Times reported that the emails were discovered during a separate investigation into former Rep. Anthony Weiner (D-NY). Weiner is married to Abedin.
 
"Director Comey has put out a letter. It has three paragraphs. It says nothing about Huma Abedin," said Mook.
 
"It says nothing about who these emails were to or from. He just said he has information that may be significant. we don't even know if it is."
 
Mook told Wallace he was inferring that the emails came from Abedin.
 
"Why wouldn't Clinton ask anybody? They could be emails from anybody in the world," Mook added.
 
After Wallace pushed the subject, Mook said Clinton had not asked Abedin what is in the emails.
 
--This report was updated at 12:28 p.m.