The president admitted that during the demonstrations, protesters not only objected to the reform plan but also to their living standards and soaring prices.
Souleyman Adoum placed in police custody late Friday during protest in Paris against pension reform.
Unions called for a "popular and historic tidal wave" of people on the streets of France as the president signs into law the controversial pension bill which the government forced through parliament without a final vote.
Energy workers deliberately cut power to protest against the government's controversial pension reform.
Nearly two weeks after Macron rammed the new law through parliament using a special provision sidestepping any vote, unions vow no let-up in mass protests to get the government to back down.
Anger demonstrations over President Emmanuel Macron's decision to raise France's retirement age from 62 to 64 had promised to impact the king's visit, with workers refusing to roll out the red carpet for British king's arrival.
Police said at least 80 were arrested, with those detained suspected mostly of possessing illegal weapons or planning to damage property or commit acts of violence, as over a million people demonstrate across the country.
Protesters gathered in Paris and many other cities, where some set fire to dumpsters and trash, and targeted various buildings to express their anger over a divisive pension plan.
No-confidence motion would need backing from around half the contingent of the opposition right-wing Republicans, a scenario seen as highly improbable.
A broad alliance of unions has called for an eighth day of street protests across France since mid-January to contest Macron's plans to raise the retirement age by two years to 64.
The nationwide strikes and protests are a crucial test both for President Emmanuel Macron’s government and its opponents.
President Emmanuel Macron wants to raise the retirement age from 62 to 64, which has proven unpopular with French workers.
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