Raffaele Fitto hit out at their plans to reform the eurozone, introducing a continent-wide treasury, finance minister and a shared budget.
The newly elected French president met with the German Chancellor to hatch plans for strengthening the eurozone after Brexit.
Speaking alongside Ms Merkel in Berlin, Mr Macron said he’d work with the German on a “road map” and that they needed to work on “profound reforms that are necessary and need common action”.
Ms Merkel said: “We each represent the interests of our own countries, but the interests of Germany are naturally closely tied to the interests of France.”
She added that she hoped for “new dynamism” in German-French relations, saying: “Europe will only do well if there is a strong France and I am committed to that.”
Their comments attracted the fury of Mr Fitto, vice chairman of the European Conservatives and Reformists Group in the European Parliament, demanding the EU delivers a “more flexible” Europe.
The Italian said: “Today, we know that the French President Macron and German Chancellor Merkel want to change the treaties.
“However, saying that we need to change them is not enough – we need to state in which direction.
“If the direction brings less Europe, more flexibility, more tax competition, more respect for national parliament – that is the right direction that we have been backing for years.
“If on the other hand, as we fear, the direction will be again more Europe, more rigidity, more forced fiscal harmonisation, more centralised impositions from Brussels – that would make the current situation worse.”
Jean-Claude Juncker, president of the European Commission, has previously proposed a federal state of Europe as part of his plan to save the EU after Brexit.
The eurocrat released a document outlining a five-point plot for member states to take between now and 2025 to try and rescue the bloc from imploding.
In March, Mr Juncker said: ‘It’s time for leadership, unity and…