Could a row over Salvini split the 5-Star Movement?

A row over whether Italy’s politicians should be immune from prosecution threatens to engulf Italian politics. The man at the centre of the debate is Italy’s Deputy Premier and Interior Minister Matteo Salvini. He could be in the dock over allegations of kidnapping and abuse of power. Except, the power of opinion in Italy could prevent any action being taken against the hard-right leader. Who is supporting Salvini, and do politicians really hold such sway against Italy’s judicial process?