The contest is widely seen as a litmus test for the populist wave that past year prompted Britain to vote to leave the European Union and USA voters to elect Donald Trump president.
French presidential hopeful Emmanuel Macron was on Wednesday heckled by factory workers in Amiens city after a visit by his far-right rival Marine Le Pen. "I gave him a review of the situation and put things in perspective".
In the French capital, Macron picked up 35 percent of the vote, compared to Le Pen's five, perhaps explaining the difficulty in finding voices willing to express support for National Front (FN) leader in the city.
On Monday, French President Francois Hollande urged voters to back Macron, who topped Sunday's first-round voting with 24 per cent, compared to 21 per cent for Le Pen.
During his election campaign, Trump dismissed the United Nations as "just a club for people to get together, talk and have a good time". I will be above partisan considerations, "Xinhua news agency quoted her as saying".
Under France's Fifth Republic, the president is the head of state, very much like a monarch in other countries, a role described by founder Charles De Gaulle as being above party politics - something Le Pen may have had in mind in her Monday night statement.
In a solemn address from the Elysee palace, Hollande said he would vote for Macron, his former economy minister, because Le Pen represents "both the danger of the isolation of France and of rupture with the European Union".
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Is Marine Le Pen far-right? "He says there is no such thing as French culture", she said.
As Le Pen took selfies with people outside the threatened plant, he was shown in a closed-door meeting with union leaders in the town of Amiens, dressed in a suit and tie.
Mr Macron backed the EUdictated labour law, which was enacted by decree of President Francois Hollande after parliament twice rejected it and sparked a year of general strikes and fierce protests.
Elodie said she was shocked that Macron had made the second round at the expense of conservative candidate Fillon.
"Marine Le Pen can not win because she's a woman".
Jean-Marie Le Pen, France's National Front political party founder, with his daughter Marine Le Pen, before their estrangement. "Macron in the Elysee (palace) is already a revolution, Le Pen won't win now, and neither will she in 2022".