Florian Philippot's decision, announced on French broadcaster France 2, comes a day after he was stripped of his party responsibilities for strategy and communications by Le Pen for refusing to leave the presidency of his association Les Patriotes [The Patriots].
His departure threatens to split the party.
Mr Philippot said he did not "like being ridiculed".
Philippot played a key role in Le Pen's effort to scrub clean her party's racist and anti-Semitic image to make it more voter-friendly.
Philippot claimed that the party's "old demons" were sneaking back into the party, a reference to hard right values. Philippot created his own political movement within the National Front to protect this major point of the party's program.
"The great enterprise of refounding the national movement to which I invite you ... but also all French people, is inspired only by duty: the duty to take action and to win so that France can remain France for its children and for the world", Le Pen told supporters September 9 in the village of Brachay, according to Deutsche Presse Agentur.
Philippot has always been one of Le Pen's closest allies.
Mrs Le Pen, who pledged after losing the presidential race to Emmanuel Macron to be the "main voice of opposition" against the new centrist government, has been overshadowed of late by far-left rebel and former presidential candidate Jean-Luc Mélenchon, whose working-class rhetoric and unabashed criticism of the young president have widened his support base. It has played out on TV in numerous interviews by Philippot and party officials.
"One should stop trying to bury the National Front", she told LCP television. Le Pen and Philippot never had a direct meeting about their differences, both say.
Jérôme Fourquet, an expert on the far-right at polling group Ifop, said Philippot's exit would deprive the party of experienced policy writers. "All those who have taken this road and led a solitary adventure have disappeared", Le Pen said.
Philippot was playing the role of victim, Le Pen said. She is heading into a party congress early next year in her most fragile position since taking over leadership of the Front from her father in 2011, with the only comfort being that there are no clear contenders for her seat.
With baseball headed to an all-time high in home runs this season, a lot of players are doing things they have never done before. That was followed by a home run from third baseman Justin Turner to give the Dodgers a 2-0 lead five pitches into the game.
The update will begin rolling out from today, but Google says it may take up to three days to appear, so keep an eye out. Similarly the phone numbers will become clickable and tapping on them will open the number in the handset's dial pad.
We have said to everyone - be very careful, report to us any deportations because they are telling us they are not happening. But these immigrant youths argued that democrats should be fighting now for all undocumented people living in the U.S.
The storm is forecast to move east of the central Bahamas - about 500 miles east of Florida - by this weekend, Shields said . The US National Hurricane Center upgraded the storm from category two to five in just a few hours.
On September 3, Pyongyang detonated its sixth nuclear device, seen as the most powerful ever conducted by the Asian country. Japan appears to be taking no chances as they moved missile batteries to beneath the preferred flightpath of North Korea.
The troops were accompanied by 241 horses, 63 airplanes, and 29 helicopters. "I fully respect the decision of the US". And between two professional appointments, the attractive also takes time to slip away to find her loved ones.
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When asked what the date was that Hart and her client were together, Bloom said it was "approximately a month ago in Las Vegas". The woman, Montia Sabbag , and her attorney Lisa Bloom , held a press conference in Woodland Hills Wednesday morning.
The recall includes a total of around 494,000 Pick-up trucks from the Ram brand with model years from 2013 to 2017 . No injuries have been reported, but owners will be notified and can get a replacement at any dealer location.
With Mercedes-Benz Stadium opening this season, the Atlanta Falcons had the biggest year-to-year jump from 2016 to 2017. The league owes this success to new stadium investments, stadium renovations and exuberating rights fees.
States sign nuclear weapons ban shunned by nations with nukes
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Suu Kyi vows to repatriate some Rohingya refugees
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Dead, 15 Hurt After 2 Buses Collide in NYC
The private bus, operated by the Flushing-based Dahlia Travel and Tours, then crashes into a corner Kennedy Fried Chicken. A person answering the phone there declined to comment; there was no immediately response to an emailed comment request.