French National Front leader Marine Le Pen is in he running for the country's presidency

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Ms Le Pen celebrated Brexit when results from the UK ballot came in and at the time called for France and all other member states to hold a similar vote.

But legal experts say the outspoken right-winger would face an uphill struggle to pull Paris away from Brussels because of France’s written constitution.

Ms Le Pen, who tweeted “Victory for freedom!" when Britain voted to leave, said EU membership had stripped France of autonomy on immigration, monetary and fiscal policy.

And with support for populists surging around the world the chance of an electoral upset in the eurozone's second largest economy is being taken seriously by those who fear for the future of the euro and the EU.