French President Emmanuel Macron criticized Friday what he called "Islamic separatism" in his country and those who seek French citizenship without accepting France's "right to commit blasphemy."

French President Emmanuel Macron speaks during a ceremony to celebrate the 150th anniversary of the proclamation of the Republic, at the Pantheon monument, Friday Sept.4. 2020 in Paris. (Photo: AP)

Macron defended satirical newspaper Charlie Hebdo, which published caricatures of the Prophet Muhammad that helped inspire two French-born Islamic extremists to mount a deadly January 2015 attack on the paper's newsroom. 

The weekly republished the images this week as the trial began of 14 people  over the attacks on Charlie Hebdo and on a kosher supermarket.

Speaking at a ceremony Friday celebrating France's democratic history and naturalizing new citizens, the French president said, "You don't choose one part of France. You choose France....The Republic will never allow any separatist adventure."

Freedom in France, Macron said, includes "the freedom to believe or not to believe. But this is inseparable from the freedom of expression up to the right to blasphemy."

Noting the trial that opened Wednesday, he said, "To be French is to defend the right to make people laugh, to criticize, to mock, to caricature."

The 2015 attacks killed 17 people and marked the beginning of a wave of violence by the Islamic State group in Europe. 

Macron's centrist government has promised a law in the coming months against "Islamic separatism" but it is not clear yet exactly what it would police. Some critics fear it could unfairly stigmatize France's largely moderate Muslim population, the largest in western Europe.