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France's highest court has ordered a corruption case centering on former President Jacques Chirac back to trial.

The Court of Cassation ruled against a last-ditch appeal by Chirac co-defendants that had led a Paris court to suspend the trial shortly after it opened in March.

The court decided Friday against a defense motion that the Constitutional Council should step in to decide whether the combining of two corruption cases into one for the trial was constitutional.

The Paris judge on June 20 is to set a date for the trial to resume.

The trial is the first involving a former French head of state since World War II and centers on Chirac's 18 years as Paris mayor, before he gained immunity from prosecution while president from 1995 to 2007.