(ANSA) - Rome, September 19 - The Constitutional Court on Tuesday ruled the case of a dispute between Palermo magistrates and Italian President Giorgio Napolitano was admissible. Napolitano turned to the Constitutional Court in July to intervene in Palermo prosectors' handling of wiretaps recorded during a probe into alleged State-mafia negotiations in the early 1990s. The Italian president said that magistrates had surpassed their powers by wiretapping the conversations of one of his legal advisors during their investigations and failing to destroy them afterwards, as the constitution mandates. "We aren't surprised," said Palermo magistrate Francesco Messineo. "The admissibility ruling is a procedural step".