Marine Tondelier

Under Marine Tondelier's leadership, Les Écologistes commissioned Pisan in 2024 to review the Julien Bayou case and issued a call for testimony to approximately 12,000 current and former members. The method was criticised on grounds of the presumption of innocence and transparency. After criminal proceedings against Bayou were closed without further action in January 2025 because no offence had been identified, the leadership expressed regret over the consequences suffered by the former MP. In 2026, disclosure of testimony from a former partner and an internal exchange between Tondelier and Sandrine Rousseau renewed criticism concerning the information held and shared by the leadership.

Role of the person profiled

Protagonist not prosecuted

Following remarks by RN mayor of Hénin-Beaumont Steeve Briois during a municipal council meeting, including 'Green Khmer', 'hysterical Taliban' and 'worse than Stalin', Marine Tondelier announced in March 2026 that she had filed a complaint for public insult.

State of the evidence

Documented

Les Écologistes' leadership suspended approximately thirty activists, including elected representatives, until the end of the municipal elections after they signed an opinion piece challenging the alliance strategy with the Socialist Party and the distancing from La France insoumise. Internal critics, including Sandrine Rousseau, denounced an 'authoritarian drift' by the leadership.

State of the evidence

Documented

Legal status — source text

Not applicable

After the March 2026 municipal elections, Les Écologistes lost several major cities, including Bordeaux and Strasbourg. The setback renewed internal criticism of Marine Tondelier's strategy, political positioning and leadership record.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Political responsibility

Selected in late 2025 to represent Les Écologistes in a left-wing primary, Marine Tondelier increasingly supported the option of an independent candidacy if the primary failed. Internal opponents disputed the change in the scope of her mandate and the procedure adopted. On 25 June 2026, the party's statutory council found the planned consultation 'irregular' because it lacked a legal basis approved by the federal council and reclassified it as a purely indicative internal opinion survey. On 6 July, approximately 65% of votes cast nevertheless supported an independent candidacy should the primary fail.

State of the evidence

Documented

Marine Tondelier advocated the possibility of temporarily suspending social network X during the presidential election to limit foreign interference and the spread of false information. The proposal prompted debate over its legal and technical feasibility and freedom of expression.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Directly implicated

During her presidential campaign, Marine Tondelier proposed legislation to 'ban lying in politics' and allow deliberate factual falsehoods to be punished by disqualification from standing for election. The proposal immediately prompted debate over the legal definition of a lie, the authority responsible for establishing it and risks to freedom of political debate.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Political responsibility

Following a tense demonstration in Auch surrounding Bertrand Venteau's trial, a post published on Marine Tondelier's page incorrectly attributed to Lionel Candelon statements suggesting that farmers could disregard regulations and wrongly identified him as president of Coordination rurale in Gers. Candelon, who chairs the Gers Chamber of Agriculture, announced a complaint for defamation and malicious denunciation.

State of the evidence

Admitted by the person

Attribution

Institutional responsibility

Following a political exchange with Minister Christophe Béchu, Marine Tondelier lodged a defamation complaint in March 2023 with the petitions committee of the Court of Justice of the Republic. The complaint was closed in May 2023. She subsequently applied to the European Court of Human Rights, which declared application no. 35846/23 inadmissible on 30 April 2025.

State of the evidence

Established by a court

Marine Tondelier incorrectly stated that 40% of Gaza's population had been 'exterminated'. The figure she had in mind came from a Lancet study estimating that recorded deaths were undercounted by approximately 40%, not that 40% of the population had been killed.

State of the evidence

Admitted by the person

Legal status — source text

Not applicable

Attribution

Personally implicated

Preparations for Les Écologistes' 2025 congress prompted strong internal criticism of the complexity and transparency of the process, involving approximately 45 votes spread over several ballots and a substantial delay in publishing some results. The use of service provider Cap Collectif for a contract worth approximately €20,000 also raised questions because a former executive of the company had become Marine Tondelier's chief of staff. Debate additionally concerned relaxation of certain rules against holding multiple offices and the role of internal figures such as Éric Piolle.

State of the evidence

Documented

After Jérôme Guedj and other Socialist activists were insulted or assaulted during the Paris demonstration on 1 May 2025, Marine Tondelier's initial reaction was strongly criticised as ambiguous, particularly when questioned about a possible antisemitic dimension and referring to Guedj's behaviour at demonstrations.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Directly implicated

Approximately ten environmentalist elected representatives and officials in Marseille warned Marine Tondelier of a possible coordinated influx of members intended to influence the 2026 municipal elections. The national leadership placed the PACA branch under supervision and launched checks.

Legal status — source text

Not applicable

Attribution

Institutional responsibility

Marine Tondelier was subjected to several months of harassment involving hundreds of telephone calls and numerous videos. Following her complaint, a woman was sentenced by the Béthune court to ten months' imprisonment in September 2025.

Role of the person profiled

Protagonist not prosecuted

During controversy over Shein's arrival at BHV, Marine Tondelier wrote that '70% of our clothes are never worn'. TF1 Info found the figure overstated in light of more recent research and traced its origins to an older survey by moving company Movinga, subsequently cited by several organisations.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Personally implicated

Giving evidence to the National Assembly inquiry into links between political movements and Islamism, Marine Tondelier said she did not believe in the 'myth of a grand Muslim conspiracy to seize power' and denounced a climate of suspicion targeting Muslims or people perceived as Muslim. Her remarks prompted political debate over how Les Écologistes approached Islamism.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Personally implicated

Following a confrontation with winegrowers in the Aude department in June 2023, two of them sued Marine Tondelier for defamation, alleging that she had implied they were responsible for an arson attack. The Narbonne Criminal Court acquitted her on 29 November 2024.

Legal status — source text

Acquitted / conviction overturned

Attribution

Accused

Course of the proceedings

1. Formally charged — Formal charge before the current outcome

Opposing the EU–Mercosur agreement, Marine Tondelier claimed its implementation would cause 5% additional deforestation in the Amazon over six years. A TF1 fact-check concluded that the underlying study instead suggested a possible acceleration of approximately 5% a year during the tariff reduction period across all ecosystems concerned, not just the Amazon.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Personally implicated

Marine Tondelier took part in the banned demonstration against large water reservoirs at Sainte-Soline on 25 March 2023. The following day she acknowledged her participation, describing it as 'civil disobedience' and stating that elected representatives had a political responsibility to attend such protests.

State of the evidence

Documented

Attribution

Directly implicated

Marine Tondelier claimed that France had committed to reducing pesticide use by 50% between 2009 and 2018 but that it had instead increased by 20%. A Franceinfo/DE FACTO fact-check found the figures accurate but misleading, particularly because the indicators used do not permit a simple summary of trends in pesticide use.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Personally implicated

Marine Tondelier claimed that conventional lettuce sold for approximately 70 cents actually cost society between €17 and €27 once its negative externalities were included, and subsequently attributed the calculation to the Court of Auditors. AFP established that the figure derived from a theoretical extrapolation repeated by MEP Benoît Biteau and could not be used to calculate the overall cost of one lettuce.

State of the evidence

Documented

Legal status — source text

Not applicable

Attribution

Personally implicated

Marine Tondelier maintained and defended rapper Médine's invitation to EELV's summer gathering despite existing criticism, followed by a more serious crisis over wordplay targeting Rachel Khan widely denounced as antisemitic. Several senior environmentalists criticised the decision or boycotted the event.

State of the evidence

Documented

Legal status — source text

Not applicable

After publication of Nouvelles du Front, examining the RN's municipal administration of Hénin-Beaumont, Marine Tondelier was prosecuted for defamation over several passages concerning local party officials. The 17th Criminal Chamber of the Paris Judicial Court acquitted her in November 2020.

Legal status — source text

Acquitted / conviction overturned

Attribution

Accused

Course of the proceedings

1. Formally charged — Formal charge before the current outcome