MANCHESTER, N.H. (AP) – Democrats have dropped a New Hampshire television station as a debate sponsor over an ongoing disagreement between union workers and management.

The Democratic National Committee and the New Hampshire Democratic Party said Friday they will not include WMUR-TV as a sponsor of the Dec. 19 debate because the station’s parent company, Hearst, has not scheduled contract negotiations with a union representing production department workers. The station’s talent will also be barred from participating in the debate, which will feature candidates Hillary Clinton, Martin O’Malley and Bernie Sanders.

The union, which represents staff directors, production technicians, photographers and satellite truck operators, has been trying for months to negotiate higher wages. WMUR general manager Jeff Bartlett did not immediately return a call seeking comment Friday.