Polls show Ms Le Pen lagging behind centrist front-runner Emmanuel Macron by around 20 points before Sunday's runoff and she needs to broaden her base to stand a chance of winning.
As the campaign enters the final few days the latest polls put Macron ahead by 61 percent to Le Pen's 39 percent.
The row comes less than a week before the all-important vote, set for Sunday. One policeman was seen spraying someone in the face.
Four police officers were hurt in clashes in Paris on May 1.
"I'm a pro-European, I defended constantly during this election the European idea and European policies because I believe it's extremely important for French people and for the place of our country in globalization", Macron told the BBC.
Former Greek Finance Minister Yanis Varoufakis came out Tuesday in support of French presidential candidate Emmanuel Macron "without equivocation" and criticized leftists who have not lined up behind the former economy minister.
Durpaire also noted the traditional right wing conservative party, the Republicans, are not as united today against Le Pen as they were against her father in 2002.
Marine Le Pen's spokesmen have acknowledged that the French far-right candidate offered up a speech that, in many parts, copied around 90 seconds of one by a former presidential candidate, and called it a "wink" toward him and his supporters.
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"She is not Joan of Arc, but she accepts the same mission".
However aides of Ms Le Pen attempted to brush off the criticism.
Cedric Villani, a high-profile mathematician and commentator wrote in the left-wing Liberation newspaper Tuesday that abstaining "is the equivalent of giving half of one's vote to Marine Le Pen in the most important election that France has had for several decades".
Macron urged people to mobilize themselves to defeat the far-right presidential hopeful. "France is something more and much more than an economic, agricultural or military power".
The similarities were also mocked by her opponents on social media.
The National Front (FN) candidate's team was unrepentant, however.
Mr Macron joined the man's son and anti-National Front protesters at an annual commemoration near the Louvre Museum in Paris.
The National Front traditionally holds a march in central Paris on May 1, and at the 1995 event, skinheads broke away and pushed 29-year-old Brahim Bourram off the bridge into the Seine River. But at the 1995 event, some skinheads broke away and pushed 29-year-old Brahim Bourram off a bridge into the Seine River, where he drowned.