The French Front National suspended its founder Jean-Marie Le Pen for his inflammatory remarks concerning Nazi gas chambers on Monday, backing the more moderate line of his daughter and current leader, Marine, reports The Telegraph.
A special meeting of party members will be called "in three months" to decide whether to strip him of the title of honorary president, a statement said.
The 86-year old, who founded the FN in 1972 and led it until 2011, refused to take part in the disciplinary hearing on Monday.
He has been accused of "taking the party hostage" through his "damaging" remarks belittling the Nazi gas chambers, praising the leader of Vichy France and his call to "save the white world".
The comments led to a bitter public feud with his daughter and party leader, Marine Le Pen.
The party's executive board was due on Monday night to decide how to deal with the veteran far-Right figure, a day after his daughter insisted that he "no longer has the right to speak in the name of the party".
In a statement, the FN politburo in Nanterre, west of Paris, said it "disapproves of the comments held and reiterated by Jean-Marie Le Pen", notably those in the anti-Semitic and revisionist magazine Rivarol in which he dubbed the Nazi death chambers a "mere detail" of the Second World War.
The politburo then swore allegiance to Ms Le Pen's more moderate line, which has seen her distance herself from her father's racist, anti-Semitic image as she seeks to woo more mainstream voters ahead of France's 2017 presidential elections.
It said Mr Le Pen's comments "in no way reflected those of the Front National, its president or governing bodies" and that it had "full confidence" in Ms Le Pen.
Mr Le Pen said he would continue to speak "in my name" and had no intention of retiring from politics.
In the latest sign of the father-daughter split, Mr Le Pen was conspicuously absent from a line-up of FN leaders on stage during the party's traditional May 1 rally in Paris. That did not, however, prevent him from seizing the podium unannounced to receive an ovation.
"I think that was a malicious act, I think it was an act of contempt towards me," Ms Le Pen said on Sunday. "I get the feeling that he can't stand that the Front National continues to exist when he no longer heads it up."
"Does he have the right over life or death [of the party]? I think not.
"In a way, the Front National's current victories also underline a form or failure of the strategy he pursued," she added. She insisted that "all options are on the table", regarding her father, including calling a special congress of renovation, in which members could vote to oust Mr Le Pen as honorary party president.
Florian Philippot, both a vice president and an MEP, called on Mr Le Pen to resign, likening him to "an old singer doesn't want to leave the stage".