The populist leader seems fond of the mini-BOT (Bill of Treasury). From The Economist:
Although Mr Salvini and other ministers have since the election said they have no plans to leave the euro, occasional noise from others adds confusion. On May 28th the parliament passed a non-binding motion asking the government to consider issuing “mini-BOTs”, low-value bills designed to help the state pay commercial suppliers. The clause on mini-BOTs had reportedly been inserted into the motion at the last minute, catching many lawmakers unawares. Claudio Borghi, a Euro-sceptic League economist and close adviser to Mr Salvini who heads parliament’s finance committee, has previously argued that mini-BOTs could be “spent anywhere to buy anything”, raising suspicion that they would act as a parallel currency in preparation for leaving the euro. As investors became uneasy, Giovanni Tria, the finance minister, was forced to respond, attempting to rule out the idea. But Mr Salvini has said he still considers it an option.