This combination of file pictures created on April 10, 2022 shows French far-right party Rassemblement National's presidential candidate Marine Le Pen posing during a photo session in Paris on Oct 20, 2021 and French President and La Republique en Marche party candidate for re-election Emmanuel Macron posing for a photo session on March 7, 2017 at his campaign headquarters in Paris. (JOEL SAGET, ERIC FEFERBERG / AFP)

DENAIN, France - Emmanuel Macron and Marine Le Pen traded blows at a distance on Monday over who would best protect French voters' purchasing power, kicking off a tense fight to win the presidential election runoff on April 24.

Macron, a pro-European centrist who became president in 2017 after easily beating Le Pen when voters rallied behind him to keep the far-right out of power, is facing a much tougher challenge this time.

Emmanuel Macron, a pro-European centrist who became president in 2017 after easily beating Le Pen when voters rallied behind him to keep the far-right out of power, is facing a much tougher challenge this time

He is slightly ahead in polls, but Le Pen, who ahead of Sunday's first round successfully tapped into anger over the cost of living and a perception that Macron is disconnected from everyday hardships, pressed on those points on Monday.

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"Emmanuel Macron, if by some mischance he was re-elected, would feel totally free to continue his policy of social wreckage," Le Pen said on a visit to a rural area southeast of Paris, mocking his comments on her policy plans and urging him to read her manifesto.

Warning of the "dark clouds" that inflation cast on France, she said Macron had failed to protect the French, adding that she would, if elected, slash the VAT on energy and bring it to zero for 100 essential food and hygiene products "so the French can continue to put fuel in their car ... and feed themselves."

Macron had equally harsh words about his rival, telling La Voix du Nord newspaper in an interview on Monday, "Mrs. Le Pen is a demagogue. She is someone who tells people what they want to hear when they want to hear it."

Macron, who has repeatedly accused Le Pen of lying, said her economic promises were a fantasy.

On a walkabout in Denain, one of the country's poorest towns in its former industrial heartland, he warned voters that Le Pen, who has successfully focused her campaign on the cost-of-living issues troubling millions, would not be able to finance her populist economic agenda and that she was lying to voters.

ALSO READ: France's Macron, Le Pen head for April 24 election runoff

In hours of sometimes heated exchanges, locals called Macron out on everything from his plans to push back the retirement age to his saying at the height of the Omicron phase of the COVID-19 pandemic that he wanted to "piss off" anti-vaxxers.

"I said that lovingly," he told a bewildered local about the much-commented "piss-off" comment.

"It's all fake. ... He's coming to talk to us now because he's scared of losing to Marine Le Pen," 36-year-old Stephanie Berta, an unemployed mother of six and a Le Pen voter, told Reuters outside the Denain town hall.

"IMPASSE"

But beyond Denain, where Le Pen on Sunday won 42 percent of votes in the town and the hard-left's Jean-Luc Melenchon came second, Macron was telling voters across France he had heard their concerns and wanted to create wealth so more could be redistributed.

He said he was ready to adapt his platform and improve it, in particular to better protect the environment.

Macron told BFM TV that he was open to discussing his unpopular proposal to push back the legal retirement age to 65. "I don't want to divide the country," he said, while insisting that people would need to work longer for the pension system to be sustainable.

A Le Pen win would send shockwaves across Europe and beyond, and deliver a jolt to the establishment similar to Britain's Brexit vote to leave the European Union or Donald Trump's 2017 entry into the White House.

France's Medef employers group said that Macron's policy plans were best placed to help boost growth in France, while Le Pen's project would lead the country to lag behind its neighbors and trigger "a very strong and unfunded increase in public spending expenditure (which) would risk placing the country in an impasse".

Interior Ministry results showed that, on Sunday, Macron won 27.84 percent of votes, while Le Pen secured 23.15 percent and Melenchon got 21.95 percent.

ALSO READ: Macron makes last-minute appeal to voters ahead of Sunday poll

Investors appeared somewhat relieved that Macron was ahead, and France's CAC 40 stock index outperformed other European peers.

Le Pen, who has left the core of her far-right, anti-immigration program unchanged, has focused her campaign on social policies including cutting the retirement age to 60 for those who start work before 20, scrapping income tax for the under-30s, and reducing the VAT on energy to 5.5 percent from 20 percent. She says her numbers add up.

Sunday's first round dealt a devastating blow to the traditional parties of the center-left and center-right, which governed France for decades.