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"Our government will not call into question the euro zone or the EU, and I am speaking on behalf of everyone", Di Maio said at a conference in Milan.
Di Maio leads the anti-establishment 5-Star Movement which governs with the right-wing League.
Both parties often criticize EU governance and once campaigned for Italy to exit the euro zone, but since forming a coalition last June they have frequently stressed that an Italexit is not on the government's agenda.