She will announce a proposed new name for the party on Sunday.
"I won't go to Lille because I don't want to become ... an accomplice to the assassination of the National Front that will be underway there", he told RTL radio.
"And what I learned is you're part of a worldwide movement that is bigger than France, bigger than Italy, bigger than Hungary, bigger than all of it".
This week Le Pen appeared heartened by the strong gains made by the allied anti-immigrant League party in Italy's election.
"Right or left doesn't mean anything and doesn't reflect the real division in France today which is between those who feel the nation is an obstacle and those who feel the nation is a jewel to be defended", she said.
The new moniker, if approved by members during a mail-in vote, will mark the ultimate break with Le Pen's father, who has called the idea a betrayal.
Le Pen's performance in a pre-election debate with Macron was seen as one of the main reasons her party was defeated.
Bannon was booted from the White House past year amid tensions and stepped down as chairman of the Breitbart News Network in January after being dubbed "Sloppy Steve" by the President for providing information to the author of a controversial White House tell all. Steve Bannon has given a big boost to French far right leader Marine Le Pen, telling a cheering crowd at a congress of her National Front party that "history is on our side".
Mario is your new copilot on Google Maps for MAR10 Day
At the time of writing, despite having the most up-to-date Google Maps app on iOS, the Mario Day feature wasn't yet appearing. During your route, Mario will ride along with you on a red go-kart until you arrive at your final destination.
In his address, Bannon praised Le Pen's vision of a political fight between nationalists and globalists, even as a few party members warned that his support could damage Le Pen's efforts to cleanse the National Front of its racist stigma.
She also said: "It is because we are Europeans that we are opposed to the European Union!"
Marion Marechal-Le Pen, a former lawmaker, is more socially conservative and economically liberal than her aunt. A new leadership structure and new bylaws are also being unveiled at the two-day congress.
Jean-Marie Le Pen said that in losing heavily to Macron his daughter had "not been equal to the challenge" - a sentiment echoed by many FN members.
National Front leader Marine Le Pen is working to unite her divided party and bolster her ability to lead it as the party meets for the first time since she lost resoundingly to Emmanuel Macron in the final round of the French presidential election last May.
"We're at a turning point. don't bury us", she said in an interview with France's Le Figaro newspaper published Friday. "He has understood like Trump, Matteo Salvini and Marine Le Pen the wish of the people to control their own destiny", he tweeted.
Since taking over the National Front's presidency in 2011, Le Pen has worked to erase the footprint of her father - who has convictions for racism and anti-Semitism - to broaden the party's appeal.