Mr Attal told Mr Bardella: “It turns out that she is Franco-Russian, that she attends closed-door meetings with confidential information on the war in Ukraine.”

Mr Bardella replied: “We’re not talking about a nuclear power plant here.”

Earlier in 2024, Ms Le Pen published a proposed law that would prevent dual-nationals from holding a wide range of jobs across the civil service, companies and public service missions.

Such bills could now be enshrined if the RN – which is leading opinion polls – ends up with an absolute majority in the Paris National Assembly following the parliamentary elections.

Gérald Darmanin, the French interior minister, said on Wednesday that the RN’s proposed policy was discriminatory and would “divide the nation”.

He said: “I don’t like this way of filtering the French.” He said it would discredit “three million French-Americans, French-Algerians, French-Portuguese, French-Moroccans”.

Ms Le Pen, who paid a personal visit to Putin in Moscow in 2017, has long been criticised for her support of Russia.

Her party received a €6 million (£5 million) loan from a Russian company in 2014, which has since been paid back.

Responding in 2022 to claims that the RN was closely tied to the Moscow regime, Ms Le Pen said: “I have no friendship with Vladimir Putin, whom I met once in my life. I don’t even have financial ties with him.”