According to court documents posted on Twitter by the leader of the National Front party, the psychological tests are to be carried out "as soon as possible" to establish whether she "is capable of understanding remarks and answering questions".
Le Pen, who has said the case against her is a violation of her freedom of expression, claims the government of France is employing the tactics of defamation that totalitarian regimes use to discredit political opponents in an attempt "to make them look insane".
"I thought I had seen it all, but no!" For having condemned Daesh (IS) horrors in tweets, the "justice system" is putting me through psychiatric tests! "How far will they go?!" she tweeted in response.
Le Pen suggested the case is part of a government scheme to discredit her. On Thursday, Sept. 20, 2018 she tweeted a decision ordering a psychiatric exam that was dated Sept. 12 and gives her 10 days to modify questions to be asked.
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Experts have told the French media that psychiatric tests are common for people facing charges like Le Pen's. The material included a picture of USA journalist James Foley's body, after the 40-year-old had been beheaded by jihadists.
Among the list of concerns were whether Le Pen is "in a unsafe state from the standpoint of psychiatry or forensic science".
But it doesn't look like Le Pen will be making an appointment with any psychiatrists.
"Daesh is this!" Le Pen wrote in a caption.
Le Pen and her populist party have long insisted they are being unfairly persecuted by France's courts and political establishment as a means to marginalize them.
If convicted, Le Pen could be punished with up to three years in prison and a fine of around $91,000. She later deleted the tweet showing Foley at the request of his family, and said she had not been aware he was in the photo.