Public school teachers in Chicago have voted to continue their strike, prompting Mayor Rahm Emanuel to threaten legal action to force their return to the job. A deal to end the strike was reached on Friday, but teacher delegates voted down the proposal in a Sunday vote. Chicago Teachers Union President Karen Lewis said delegates want more time to consult with rank-and-file members.

Karen Lewis: “Clearly, a contract is always a set of negotiations. No sides are ever completely happy, but our members are not happy, and they want to have the opportunity to talk to their members to see. They still want to know is there anything more they can get. We’ve told them basically that we feel that this is the deal that the board had. They still want to have the opportunity to discuss it. When you have expectations of democracy, then that’s what happens. So, people have exercised that.”

Sunday’s vote came one day after thousands of teachers and their supporters rallied in Chicago’s Union Park for the largest protest since the strike began. The standoff has centered around education reforms, including a proposed teacher evaluation process the union says relies too heavily on standardized testing. In response, Emanuel has called the strike “illegal” and said he will seek a court injunction to bring it to an end.