The interrogation under warning of Shas chairman and Interior Minister Aryeh Deri on charges of money laundering and tax evasion will have no impact on the government's stability, at least in the short term. On the other hand, it does mean that two of the most senior figures in the government are now suspected of criminal behavior. The other is Prime Minister Benjamin Netanyahu.
Because of their complexity, the investigations into Netanyahu and Deri are expected to last months, if not longer. It is quite conceivable that both will enter the next election cycle under a cloud of suspicion.