Thousands of protesters took to the streets across France on Saturday, responding to a call from a far-left party leader who criticised as a power grab the president’s appointment of a conservative new prime minister, Michel Barnier.

The protests are a direct challenge to President Emmanuel Macron’s decision to bypass a prime minister from the far-left bloc following a deeply dividing legislative election in July.

The left, particularly the France Unbowed party, views former EU chief Brexit negotiator Mr Barnier’s conservative background as rejecting the electorate’s will, further intensifying the EU’s second economy’s already charged political atmosphere.

Michel Barnier sitting on stage with his image as a backdrop
Former EU Brexit negotiator Michel Barnier (Stefan Rousseau/PA)

Authorities expected tens of thousands of demonstrators. In Paris, protesters gathered at Place de la Bastille and tensions ran high as police prepared for potential clashes.

Other rallies nationwide include the southwestern cities of Montauban and Auch.

In Montauban, the demonstrators denounced Mr Barnier’s appointment as denying democracy, echoing France Unbowed leader Jean-Luc Melenchon’s fiery rhetoric from recent days.

“The people have been ignored,” a rally speaker told the crowd.

Jean-Luc Melenchon joining a protest in Paris
France Unbowed leader Jean-Luc Melenchon, centre, joins a protest in Paris on Saturday (Michel Euler/AP)

While Mr Barnier was meeting healthcare workers at Paris’s Necker Hospital for his first official visit as prime minister, opponents say the unrest in the streets is shaping his government’s future.

Mr Barnier, who is working to assemble his Cabinet, expressed a commitment to listening to public concerns, particularly about France’s public services.

Jordan Bardella, leader of the far-right National Rally (RN), warned that Barnier was “under surveillance” by his party as well. Mr Bardella, speaking at the Chalons-en-Champagne fair, called for the prime minister to include his party’s priorities in his agenda, particularly regarding national security and immigration.

Mr Barnier, 73, is the oldest of the 26 prime ministers that have served modern France’s Fifth Republic. He replaces the youngest, Gabriel Attal, who was 34 when he was appointed just eight months ago.

Michel Barnier and Gabriel Attal
New prime minister of France, Michel Barnier, right, and outgoing French prime minister Gabriel Attal arrive for a handover ceremony in Paris on Thursday (Michel Euler/AP)

Mr Attal was forced to resign after Mr Macron’s centrist government suffered a major defeat in the July snap legislative elections. Mr Macron called the election in the hope of securing a clear mandate, but it instead produced a hung parliament, leaving the president without a legislative majority and plunging his administration into turmoil.

Mr Attal was also France’s first openly gay prime minister. French media and some of Mr Macron’s opponents, who immediately criticised Mr Barnier’s appointment, quickly dug up that, when serving in parliament in 1981, the new prime minister had been among 155 MPs who voted against a law that decriminalised homosexuality.

Though Mr Barnier brings five decades of political experience, his appointment offers no guarantee of resolving the crisis.

His challenge is immense: He must form a government that can navigate a fractured National Assembly, where the political spectrum is deeply divided between the far left, far right, and Mr Macron’s weakened centrist bloc.

The outcome of the snap poll, far from providing clarity, has served only to destabilise both the country and Mr Macron’s grip on power.

The president’s decision to turn to Mr Barnier, a seasoned political operator with deep ties to the European Union, is seen as an attempt to bring stability to French politics. And Mr Barnier, who gained prominence as the EU’s chief Brexit negotiator, has faced daunting tasks before.

Critics say Mr Macron, elected on the promise of a break from the old political order, now finds himself battling the instability he once promised to overcome.