On Wednesday Le Pen posted three graphic pictures of executions by ISIS in response to French journalist Jean-Jacques Bourdin, who she said had drawn a parallel between her party – the National Front – and the terrorist group.
The National Front failed to win a single region during regional elections on Sunday, but Ms Le Pen insists she is still popular enough to become President of France in 2017.
French prosecutors in Nanterre, a suburb of Paris, have launched an investigation into “the dissemination of violent images” by the leader of the National Front party.
“If you would like to discuss the profession, let us talk about that, incidentally, because here we’re discussing the profession of our space”, she said during the rally.
Far right leader Marine Le Pen has pledged to keep fighting to expand voter support for her National Front party, striking an upbeat tone despite a stinging defeat in regional elections.
Foley’s family condemned Le Pen’s use of the photograph showing their murdered son, calling on the politician to remove her tweets immediately.
Le Pen had been riding high after extremist attacks and an unprecedented wave of migration into Europe, and the party came out on top in the voting in France’s 13 newly drawn regions in the first round a week ago.
“This is Daesh (an Arabic acronym for the Isis group)”, Le Pen fired back in a series of tweets picturing grisly Isis atrocities.
During her October 20 trial, Le Pen said she was “interested in dealing with the problems of the French and not with references to the past or history, 70 years ago”.
Party bash spokesman Alain Vizier wouldn’t remark on why Le Pen took down the Foley photo.
Ms Le Pen said she was trying to show the distinction between the two.
Interior Minister Bernard Cazeneuve alerted the police to look into the tweets “as they do every time these photos are published”.
Bourdin, during his morning show known for combative one-on-one interviews, suggested there were “links” between Front National (FN) and ISIS.
“I’m sorry, but for those who like talking a lot about World War II, if it comes to talking about the Occupation, we can talk about it, because that (Muslims praying on the street) is the occupation of territory”, she told a crowd in Lyon.