
Mr de Villepin could get as much as five years in prison and a 45,000 euro (£41,000) fine if he is convicted of the charge.
Mr de Villepin’s trial is being held in the Grande Chambre of the Palais de Justice next to Notre Dame cathedral in Paris.
Although he is named as the victim of De Villepin’s alleged wrongdoings, President Sarkozy will not have to give evidence.
Mr de Villepin has denied that he did anything wrong.