HARDtalk is at the Ambrosetti Forum in northern Italy at an annual political gathering which always draws the country's leading politicians: and there is no question who is the dominant figure this year. Stephen Sackur speaks to Matteo Salvini- Italy's Deputy Prime Minister and arguably the most important populist politician in Europe today. He has risen to power with strident denunciations of immigration and the European Union. What does his success mean for Italy and Europe? Show less