The victory of the "No" votes in the 2016 Italian constitutional referendum prompted the resignation of Prime Minister Matteo Renzi, the chief proponent of both the constitutional reform and the "Italicum" law. Electoral law became a pressing issue, as the "Italicum" was written under the assumption that the Senate would be an indirectly-elected body by the next general election. As such, the Senate was not addressed in the bill, and remained under the previous election law ("Porcellum"). The issue of two different election laws for the two houses of Parliament was further compounded after the Constitutional Court ruled that the two-round aspect of the "Italicum" was unconstitutional, revising part of the law, and effectively removing one of the distinctive aspects of the law, whose main goal was to guarantee the existence of a parliamentary majority.