(CNN) — Bernie Sanders’ presidential campaign filed suit in federal district court in Washington against the Democratic National Committee, an attorney for the candidate told CNN Friday.
Earlier Friday, the DNC cut off Sanders from a crucial database and said the Vermont senator’s presidential campaign exploited a software error to improperly access confidential voter information collected by Hillary Clinton’s team.
The revelation poses a setback for Sanders, who is mounting a liberal challenge to the former secretary of state.
The DNC database is a goldmine of information about voters and being blocked from it could complicate Sanders’ outreach efforts. The timing is also challenging, just weeks before Clinton and Sanders are slated to compete in the Iowa caucuses.