Greek Prime Minister Alexis Tsipras's plan to hold a referendum on July 5 on creditors demands for austerity has all but killed off talks for aid and left the country close to a default and a financial crisis that could pave the way for a euro zone exit. If Tsipras were to resign, the president could call opposition party leaders and try to form a minority, cross-party government of pro-euro parties like the centrist To Potami, the centre-left PASOK and the conservative New Democracy to implement the bailout programme accepted by Greeks.