Story highlights "the campaign has withdrawn its lawsuit against the DNC today but continues to implore the DNC to address the systemic instability that remains in its voter file system," the campaign said

"The Sanders campaign never "exported" any unauthorized voter file data," the campaign added

Washington (CNN) Bernie Sanders' campaign on Friday withdrew its lawsuit against the Democratic National Committee after claiming the party had unfairly blocked its access to a critical voter database in December.

The lawsuit came after a Sanders staffer exploited a software error to improperly access confidential voter information collected by Hillary Clinton's team. The DNC database is a goldmine of information about voters and being blocked from it threatened to complicate Sanders' outreach efforts just weeks before the Iowa caucuses. The incident also fueled a long-held belief in the Sanders camp and among his allies that the DNC was stacking the deck in favor of Clinton.

A DNC investigation, the results of which were also released Friday, concluded that the wrongdoing did not go beyond the four Sanders staffers who accessed the database and were fired soon after the incident came to light.

"With the investigation behind us, the campaign has withdrawn its lawsuit against the DNC today but continues to implore the DNC to address the systemic instability that remains in its voter file system," Sanders' campaign said in a statement.

The DNC agreed to restore the Sanders campaign's access to the database by the next day. The campaign agreed to cooperate in an independent investigation of the data breach and to pay a share of those costs.

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