PARIS — A top aide to the French far-right leader Marine Le Pen announced on Thursday that he was leaving her National Front party, the latest sign of turmoil in the organization as it struggles to recover from her defeat in the presidential election this year.

Florian Philippot, the National Front’s vice president in charge of communications and strategy since 2012, told the France 2 television channel that he was leaving the post after weeks of tensions with other party officials over the reasons for her defeat and the strategy going ahead.

“I was told that I was vice president in charge of nothing,” Mr. Philippot said, reacting to Ms. Le Pen’s decision a day earlier to relieve him of his duties. “I do not have a taste for ridicule, and I have never had a taste for doing nothing, so of course I am leaving the National Front.”

Mr. Philippot, 35, was seen as one of the architects of the National Front’s so-called undemonization strategy that aimed to attract more voters and break into France’s political mainstream by shunning the party’s xenophobic and racist roots.