Tunisian President Kais Saied issued on Wednesday a decree to call voters to a referendum on a new constitution on July 25, the official gazette said, ignoringthe opposition’s calls to reverse the controversial move. Saied last week named law professor Sadok Belaid to head an advisory committee that included law and political science deans, to draft a new constitution for a “new republic,” excluding political parties from restructuring the political system. The main political parties have said they will boycott the unilateral restructuring of politics. The powerful UGTT union also refused to t…