"The Director owes it to the American people to immediately provide the full details of what he is now examining. We are confident this will not produce any conclusions different from the one the FBI reached in July," Clinton campaign chairman John Podesta said Friday in a statement.
The FBI told Congress earlier Friday that new Clinton emails were under review by the agency.
"FBI Director [James] Comey should immediately provide the American public more information than is contained in the letter he sent to eight Republican committee chairmen. Already, we have seen characterizations that the FBI is 'reopening' an investigation but Comey's words do not match that characterization," Podesta said.
"Director Comey's letter refers to emails that have come to light in an unrelated case, but we have no idea what those emails are and the Director himself notes they may not even be significant."
Podesta also took a shot at Republicans and GOP presidential nominee Donald Trump for "baselessly second-guessing the FBI" and "browbeating the career officials there to revisit their conclusion."
Comey in July announced he did not recommend filing charges against Clinton over the email server.