In a dramatic move, the FN's executive committee questioned the 87-year-old for three hours and voted to exclude him over inflammatory comments that proved too much for Marine Le Pen, pushing him out of a party he led for close to four decades.
But he immediately announced his intention to appeal the decision in court.
“There is indignation, there is sadness, it's always trying when one has the feeling of not having made any mistake, of having expressed one's opinion as a politician,” he told the iTele television network.
“I'm a father, so when unfair attacks come from my family, from my daughter, I am more affected than if it were an unknown opponent,” he said, adding he felt he was the “victim of an ambush.”
A gifted orator with a taste for controversy, Le Pen had for years been an irritating thorn in the side of his daughter, who took over the party from him in 2011 and had tried to steer it away from the overt racism and anti-Semitism of its past.
Marine Le Pen openly split with her father, saying he was committing “political suicide”, and suspended him from the party.
But the ageing provocateur has shown little interest in going quietly, successfully challenging his suspension in court and barging onto the stage during a major FN rally in May.
The FN had been on something of a roll, having scored unprecedented election results in the past two years, notably coming first in European polls in 2014.
A struggling economy and growing distaste for mainstream politics has helped the party, with Marine Le Pen skillfully repackaging the party's traditional dislike of outsiders as opposition to the EU and defence of secularism.
But Jean-Marie Le Pen has been an awkward reminder of the party's roots — a “parasite” on the party, in the words of Philippot — when it should be focusing on regional elections in December.
Always keen to position himself outside the mainstream, Le Pen's provocative rhetoric nonetheless brought the party to the forefront of politics after a slow start in the 1970s — even reaching the second round of presidential elections in 2002.
That seemed to mark the high-water mark of his party's chauvinistic appeal, however, as a stunned France responded with days of anti-racism rallies that helped his unloved centre-right rival Jacques Chirac back into office.
Le Pen can still count on support from a die-hard rump within the party, and the man who became an orphan in his teens and survived the brutal wars of Indochina and Algeria is a born fighter.
In a newspaper column this week, the FN patriarch said: “One thing is certain… the political line that I have represented for decades will not disappear from the national scene.”