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Investigators have taken the hard drive out of former Rep. Anthony Weiner's laptop and made a mirror image of it to immediately begin pulling data.
Weiner's laptop contained hundreds of thousands of emails, but the FBI team is focusing only on the thousands that appear to be associated with Huma Abedin, a Clinton insider and Weiner's now estranged wife, sources familiar with the investigation said.
Investigators are targeting work-related emails and any emails that may have gone to the private Clinton server. The FBI will use computers to eliminate any emails that it has already seen. Agents will also look at the time frame when Clinton was at the State Department but may include some time afterward, according to sources.
The FBI investigators working on the latest cache of emails are the same ones who conducted the earlier Clinton private email server probe. It's a collection of cyber and forensic experts and counterintelligence agents, numbering in the dozens. The goal was to have people most familiar with this case step back into it, said sources familiar with the investigation.
The FBI hasn't yet determined if the newly discovered emails are truly new to the bureau or whether any of them contain any sensitive information.
The emails were found as part of a separate criminal investigation as FBI agents in New York were analyzing a laptop used by Weiner, who was accused of sending sexually explicit messages to an underage girl. Since the Clinton-related emails were found while investigating another case, the FBI needed a separate warrant to examine those messages.
Federal agents discovered the emails weeks ago but presented the findings to FBI Director James Comey only last Thursday. On Friday he sent a letter to key members of Congress informing them of the update. That sparked a frenzy in the Clinton campaign and an immediate backlash against Comey, as lawmakers and former officials on both sides of the aisle demanded for a more complete understanding of the new information. It is long-standing DOJ tradition to steer clear of potentially influential investigative actions so close to an election.
On Sunday the FBI obtained the appropriate warrant and began reviewing thousands of emails.
Comey is receiving regular updates on the investigation, and if something definitive develops quickly, he might consider whether to release additional information.
On Monday the Department of Justice said in a letter that it was moving as "expeditiously as possible" in response to Democrats and Republicans in Congress who asked for additional information related to the FBI's investigation.
"We assure you that the department will continue to work closely with the FBI and together dedicate all necessary resources and take appropriate steps as expeditiously as possible, wrote Assistant Attorney General Peter Kazik in the letter.
Officials in the Justice Department weren't trying to block the FBI from reviewing these emails, according to sources familiar with the discussions. However, there was tension over whether the FBI should notify Congress about it, with the knowledge that it would be immediately leaked and could affect an election that is underway with early voting in some states, said those sources.
Ben Siegel contributed to this story.