Documents show Sanders staffers breached Clinton voter data

Bernie Sanders Campaign Accused of Hillary Clinton Data Breach
Bernie Sanders Campaign Accused of Hillary Clinton Data Breach

After Bernie Sanders' presidential campaign was disciplined by the Democratic National Committee for improperly accessing the Hillary Clinton campaign's proprietary voter database, documents obtained and reviewed by NBC News appeared to show that at least four individuals affiliated with the Sanders campaign conducted searches and saved the Clinton campaign's lists of potential voters over a period of more than 40 minutes.

NBC News has not independently verified the documents in this unfolding story, but the records appear to shed new light on the depth of the data breach.

READ MORE: Sanders campaign fires data director after breach of Clinton files

The DNC has revoked the Sanders' campaigns credentials to access the data until an investigation has been conducted.

The Sanders campaign responded Friday by calling the staffers' actions "inappropriate" but threatening to sue the DNC for what it calls "a heavy-handed attempt to undermine our campaign."

"Rather incredibly, the leadership of the DNC has used this incident to shut down our ability to access our own information, information which is the lifeblood of this campaign," said Sanders campaign chief Jeff Weaver.

"We are announcing today that if the DNC continues to hold our data hostage, and continues to try to attack the heart and soul of our grassroots campaign, we will be in federal court this afternoon seeking immediate relief," he said.

Weaver added that the campaign has fired one staffer involved in the incident and that it is internally investigating whether other individuals should be disciplined.

"We are running a clean campaign," he said.

The breach happened after a software error at the technology company NGP VAN, which provides campaigns with voter data. As a result of the glitch, "all users on the system across the Democratic campaigns were inadvertently able to access some data belonging to other campaigns for a brief window," DNC spokesman Luis Miranda said in a statement.

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Earlier Friday, in an interview with MSNBC's Tamron Hall, Democratic National Committee Chair Debbie Wasserman Schultz said the allegation is that the Sanders staffer or staffers accessed the Clinton campaign's voter-file information, exported it and downloaded it.

Another person familiar with the investigation also told NBC News that a total of four individuals affiliated with the Sanders campaign appear to have accessed the data, including national data Director Josh Uretsky, who has since been dismissed by the Sanders campaign, and Deputy National Data Director Russell Drapkin.

A series of documents outlining an audit trail maintained by the database company, obtained and reviewed by NBC News, shows that the four individuals spent a total of about 40 minutes conducting searches of the Clinton data. Those searches included terms that point to Sanders' team gaining access to proprietary lists from more than 10 early voting states of Clinton's likely supporters as well as lists for Sanders backers. That data was saved to personal folders.

It also appears that Drapkin "suppressed" two folders after the database company became aware of the breach.

The Clinton campaign learned of the breach on Wednesday, a source told NBC News.

The DNC's suspension of Sanders' access to the information means that Sanders will be at least temporarily unable to read crucial voter data in the weeks before the Iowa and New Hampshire nominating contests. The information is used by campaigns to determine their strategy for voter outreach and targeting.

A DNC official said that the campaign's credentials to access the NGP VAN "until a full explanation is received and proof is provided to the affected campaign that information and data inappropriately gathered has been disposed of."

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In a statement earlier Friday , Sanders' campaign faulted NGP VAN, the data systems vendor, for continuing to "make serious errors."

"On more than one occasion, the vendor has dropped the firewall between the data of different Democratic campaigns," the campaign said. "Our campaign months ago alerted the DNC to the fact that campaign data was being made available to other campaigns. At that time our campaign did not run to the media, relying instead on assurances from the vendor.

"Unfortunately, yesterday, the vendor once again dropped the firewall between the campaigns for some data."

The Washington Post was the first media outlet to report the breach.

Sanders and Clinton will meet next at the Democratic debate on Saturday.

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