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WASHINGTON (CBSMiami/AP) — Trouble on the horizon for presidential hopeful Bernie Sanders.

The Democratic National Committee temporarily barred his presidential campaign from accessing the DNC’s voter file after a software error allowed at least one member of Sanders’ staff to look at Hillary Clinton’s private campaign information, a spokesman for the campaign said Friday.

It’s something Sanders’ campaign says they will not stand for.

“We are announcing today that if the DNC continues to hold our info hostage we will be in court this afternoon seeking immediate release,” said Jeff Weaver Bernie Sanders’ Campaign Manager.

In response,Rep. Debbie Wasserman Shultz who is head of the DNC, told CNN, “We have been trying for the last two days to get information from the Sanders campaign… We are initiating an independent audit.”

She went on to say, “What they’ve done is like if you find the front door of your house unlocked and someone goes inside your house and takes things from there and then when they are caught still wants access to the house,” said Rep. Wasserman Schultz.

Sanders spokesman Michael Briggs told The Associated Press that the campaign had fired a staff member who reviewed the data, but blamed a vendor who runs the DNC’s voter database for making “serious errors.”

The DNC maintains an extensive list of voter information and rents it out to campaigns, which update it with their own data. The data allows campaigns to target likely voters and anticipate what issues might motivate them to support a candidate.

It remained unclear how long the Sanders campaign would be barred from accessing the DNC data, but the information could be crucial in his campaign’s ability to identify and persuade voters in the kickoff February contests of Iowa and New Hampshire. Sanders has built a strong following among young voters and liberals, but Clinton has maintained a lead in the kickoff state of Iowa and in national polls.

The data breach was first reported by The Washington Post.

Firewalls are put in place to prevent campaigns from looking at data maintained by their rivals. But officials said the vendor that runs the system, NGP VAN, used a software patch on Wednesday that allowed all users on the system to briefly access data belonging to other campaigns.

DNC spokesman Luis Miranda said Friday that the party committee “places a high priority on maintaining the security of our system and protecting the data in it.”

He said the DNC instructed NGP VAN to conduct an analysis of any users who accessed the data and report back.

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(TM and © Copyright 2015 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2015 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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