Mr Renzi's comments, in a speech in Florence last week, come amid a growing storm over the nomination of Mr Juncker as president of the European Commission. David Cameron will call for a vote from fellow EU leaders at Thursday's summit in Ypres if there is an attempt to rubber-stamp Mr Juncker in the role. Mr Cameron opposes the candidacy of the former prime minister of Luxembourg, whom he sees as preventing EU reforms and is seen by some as a politician with an instinct for ever-closer European integration.