FBI agents reportedly knew early this month about the new emails that the agency now says are "pertinent" to the investigation into Hillary ClintonHillary Diane Rodham ClintonClinton lawyer's indictment reveals 'bag of tricks' Attorney charged in Durham investigation pleads not guilty Attorney indicted on charge of lying to FBI as part of Durham investigation MORE's private server — but did not brief FBI Director James Comey until late last week.
Comey was reportedly told about the new messages on Thursday, The Washington Post reported.
On Friday, less than two weeks from Election Day, Comey sent a letter to lawmakers saying emails "pertinent" to the investigation of the former secretary of State had been discovered and the FBI would be reviewing them.
The FBI director said the team should "take appropriate investigative steps designed to allow investigators to review these emails."
The Washington Post reported that it is not clear why the FBI agents waited to brief Comey after discovering in early October the emails in question on a computer it seized in connection with a separate investigation.
The emails were discovered while look into former Rep. Anthony Weiner (D-N.Y.) for an alleged online relationship with a 15-year-old girl. Weiner is the estranged husband of longtime Clinton aide Huma Abedin.
In the letter Comey sent on Friday, he wrote the agency does not know "the significance of this newly discovered collection of emails." Yahoo News reported Saturday the FBI did not have a search warrant to review the newly obtained emails.
Since the letter was released Friday, Democrats have been ramping up their calls for the FBI to release more information about what the emails contained and whether they are significant.
In July, the FBI director announced he would not recommend criminal charges over the Democratic presidential nominee's use of a private email server while serving as secretary of State.
Republican presidential nominee Donald TrumpDonald TrumpKinzinger says Trump 'winning' because so many Republicans 'have remained silent' Our remote warfare counterterrorism strategy is more risk than reward Far-right rally draws small crowd, large police presence at Capitol MORE called the situation the "biggest scandal since Watergate."