(Bloomberg) -- Bernie Sanders’ presidential campaign threatened to challenge the Democratic National Committee in federal court on Friday for "actively undermining" its work following an incident that led to the firing of its national data director.

Sanders staffers exploited a temporary glitch in the DNC's voter database to save lists created by Hillary Clinton’s campaign, according to an audit of the breach obtained by Bloomberg. In response, Sanders' team was banned from accessing all of the DNC's data as well as its own data, a move that is "taking our campaign hostage," campaign manager Jeff Weaver said at a press conference outside Sanders's Capitol Hill campaign office.

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