The tough leftist is striving to position himself as the main voice of opposition against the president, and has made it his duty to challenge the government’s radical reform agenda.
Mr Mélenchon said: “Mr Macron is incredibly hardline and no-nonsense, which explains why his inner-circle has blindly rallied behind him.
“He basically told them: ‘Look, I am the boss, and now we’re going to crush those who oppose us.
“It’s part of his strategy. Mr Macron is an intelligent and extremely determined man.
“He’s also a lot more calculating than he lets on. His political style is a combination of (Tony) Blair’s and (Margaret) Thatcher’s.”

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Mr Mélenchon, who was knocked out of the presidential race in April despite garnering 19.6 per cent of the first-round vote, just 4.9 percentage points less than Mr Macron, has successfully established himself as the main – and loudest – voice of opposition against the new president.
The hard-left firebrand has also repeatedly called for mass demonstrations against the centrist government’s radical reform programme.
He is fiercely opposed to the contentious labour code reform, which was passed on Friday and is to come into force as early as next week after being fast-tracked through parliament using executive decrees.
Mr Mélenchon, who has urged French people to take to the streets on Saturday to protest against the loosening of the country’s complex labour laws, said: “He knows exactly what he’s doing… He’s busy repelling assaults on all fronts.
“Winning an election doesn’t give those in power carte blanche to do what they want with the country… The battle of France has only just begun.”