Follow CBSMIAMI.COM: Facebook | Twitter

WASHINGTON, D.C. (CBSMiami/AP) — The Bernie Sanders campaign is pressing ahead with a lawsuit over access to a Democratic National Committee voter database.

READ MORE: Broward Commissioner Dale Holness To Run For Late Rep. Alcee Hastings’ Congressional Seat

Sanders on Thursday formally notified the DNC after a U.S. District Court judge had threatened to dismiss the campaign’s lawsuit if it failed to take action.

Sanders sued in December after the DNC temporarily barred his campaign from accessing its massive trove of voter information.

READ MORE: Wynwood Comes Alive On First Night Countywide Curfew Is Lifted

The move came after Sanders’ staff improperly accessed data compiled by the campaign of rival Hillary Clinton. Sanders apologized for the breach, and his campaign’s access to the data was restored after four days.

In court papers, the campaign claims it lost about $600,000 per day in political donations during the outage. The lawsuit seeks in excess of $150,000 in damages.

MORE NEWS: Stimulus Check Update: Is A Fourth Relief Payment Coming?

(©2016 The Associated Press. ©2016 CBS Local Media, a division of CBS Radio Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.)