A "yellow vest" demonstrator lost his hand during clashes with police outside the main parliament building in Paris on Saturday, witnesses told AFP, during a 13th weekend of anti-government protests across France.

A month of "yellow vest" protests have taken a further toll on the popularity of French President Emmanuel Macron, a new poll showed Sunday, with analysts saying he will be forced to change his style of governing.

Thousands of France's "yellow vest" demonstrators were expected to take to the streets again on Saturday, a month after the start of their protest movement which has plunged President Emmanuel Macron's government into its biggest crisis.

French riot police clashed with "yellow vest" protesters in central Paris on Saturday during the latest wave of demonstrations against high living costs which have shaken President Emmanuel Macron's authority.

The French government will consider imposing a state of emergency to prevent a recurrence of France's worst riots in years, but while it is open to dialogue it will not change course, its spokesman said on Sunday.

Emmanuel Macron's popularity took a further hit in recent weeks, according to a poll on Sunday, as fuel tax protests rumbled on across France in the latest sign of discontent with the president's economic reforms.

The former investment banker won the 2017 election with 66.1% of the vote on a reformist project to modernise the euro zone's second largest power.

The disgraced former bodyguard at the centre of the biggest scandal of Emmanuel Macron's young presidency is due to appear Wednesday before a Senate committee which will quiz him over his close ties to France's maverick leader.

The most damaging scandal of Emmanuel Macron's presidency deepened on Saturday as his interior minister faces a grilling over his response to a top security aide caught on video striking a young man at a Paris protest in May.

French President Emmanuel Macron has decided to fire the bodyguard who was caught on camera hitting a May Day protester after "new facts" emerged about the alleged misdemeanour, the president's office said on Friday.

French President Emmanuel Macron came under fire on Thursday after his office suspended one of his aides who was caught on camera striking a May Day protester, but did not inform law enforcement authorities.

President Emmanuel Macron upbraided a French teenager on Monday after the boy addressed the president informally as "Manu" and sang the socialist anthem in front of him.