"Today," she told a crowd of several thousand, "the adversary of of the French people is still the world of finance, but this time it has a name, it has a face, it has a party, it is fielding its candidate who could be elected. He is called Emmanuel Macron".

While a string of high-profile figures have come out in support of Mr Macron in recent days - from Zinedine Zidane, the footballer, to Thomas Enders, head of Airbus - the far-Right candidate received a boost over the weekend when Eurosceptic 'sovereignist' Nicolas Dupont-Aignan threw his weight behind her.

Mr Dupont-Aignan scored just under five per cent in the first round, when he received the backing of ex-UKIP leader Nigel Farage.

Opening the Villepinte rally, he accused the "immature and agitated" Mr Macron of wishing to "definitively shut the French inside the prison of the EU".

The rallies come as unions stage a series of marches across the French capital for workers' rights.

However, splits emerged within the major unions over what stance to adopt regarding the presidential candidates. Some factions are going against their leadership to call for members to vote "neither (for Ms Le Pen) nor (for Mr Macron)" - seen by many leftists as an enemy of the worker. A banner of one dissenting faction of the CGT union reportedly read: "Neither plague nor cholera."