Marine Le Pen made the comments about Muslim street prayers in 2010.
“Street prayers are illegal, they are a way to take hold of a territory to impose a religious law which is contrary to the law of the Republic, contrary to secularism.” she told reporters outside the court in Lyon.
If found guilty, Marine Le Pen potentially faces a year in jail and a fine of 45,000 euros.
Judges will rule on the case in December.
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