In March 2016 President Zaia announced that he had written to Prime Minister Matteo Renzi in order to start the negotiation both on the organisation of the referendum on autonomy and the devolution of further powers to Veneto according to article 116 of the Constitution. Zaia proposed the referendum to be held on the very same day of the 2016 constitutional referendum (which would reduce the regions' powers—article 117, while expanding the powers that can be devolved to regions according to article 116 and creating a regionalised Senate), a notion deemed legally impossible by undersecretary Gianclaudio Bressa, and the negotiation started in May.