D.C. Mayor Vince Gray is pressing forward with his plan to furlough city workers for four days this year in an effort to save the city $19 million.

Gray will introduce emergency legislation on Tuesday that will formalize details of the furlough plan the council approved last month as it closed a $188 million budget gap.

The unpaid days off will take place on Presidents Day, Emancipation Day, Memorial Day and Independence Day. Labor Day will be held in reserve if further cuts are needed, Gray said during a breakfast with council members Wednesday.

Several agencies are exempt from the furloughs including the police and fire departments, and independent agencies such as the housing authority, the convention center, and the water and sewage authority.

Gray said City Administrator Allen Lew has already met with union representatives to discuss the cost-saving measure.