French far-right National Front leader Marine Le Pen leaves the polling booth as she votes in Henin-Beaumont, northern France, in this?March 29, 2015 file photo.?France goes to the polls in a two-round departmental election for local officials on March 22 and March 29. [Photo/Agencies]

PARIS - A bitter family feud between National Front leader Marine Le Pen and her father Jean-Marie deepened on Wednesday as she accused the 86-year-old founder of the far-right party of sabotaging its efforts to move into the political mainstream.

Jean-Marie Le Pen, who last week defended a past comment that Nazi gas chambers were a "detail of history", was quoted on Tuesday as calling France's Spanish-born Prime Minister Manuel Valls "the immigrant" and defending Philippe Petain, leader of the war-time government that cooperated with Nazi Germany.

"Jean-Marie Le Pen seems to have descended into a strategy somewhere between scorched earth and political suicide," Marine Le Pen, who took over the party from her father in 2011, said in a statement issued by the FN in her name.

"His status as honorary president does not give him the right to hijack the National Front with vulgar provocations seemingly designed to damage me but which unfortunately hit the whole movement," she said.

Marine Le Pen has tried to rid the anti-immigrant party of its anti-Semitic image and widen its voter appeal as she readies a bid for the French presidency in 2017. Polls suggest she could make it into the second-round run-off of a presidential election but is unlikely to win.

She added she would oppose her father's bid to lead the party in the southern region of Provence-Alpes-Cote d'Azur in December local elections where the party is hoping to make gains after strong performances in town hall and departmental votes.

Jean-Marie Le Pen's latest remarks came in an interview with the far-right magazine Rivarol. Contacted by Reuters late on Tuesday, he confirmed he had given the interview.

Marine Le Pen already distanced herself from her father last June after a quip about a French Jewish singer that included an implied reference to concentration camp ovens.