(ANSA) - Genoa, May 25 - Premier Matteo Renzi on Monday reiterated his call for a single union to replace Italy's dozens, along the lines of the German model. "We need to think about ...a union representation law," the premier told Liguria's Primo Canale in an interview. "When you sit in meetings with 17 different unions, you ask yourself is it really necessary to have so many". The Constitution upholds the freedom to unionize without government interference, and also workers' right to participate in company management within limits set by law.