>> translator: it is now, clearly, proven there is no right-wing government possible with netanyahu at its head. it is either a fifth election, or a unity government. >> reporter: once, a close aide to the prime minister. now, perhaps, the man to sink netanyahu's 12-year, unbroken run, as israel's leader. >> translator: i am announcing, today, that i intend to act, with all my strength, to form a national-unity government, together, with my friend, so that, god willing, together, we will rescue the country from this tailspin and we will get israel back on track. >> reporter: minutes later, netanyahu lashed back. >> translator: he is deceiving the public, again. the same lies, the same hollow slogans about hatred and division. this, from a man, who was actually contributing to hatred and division. a man, who is committing the deception of the century. >> reporter: apparently, no-greater crime for netanyahu than seeking to create a left-wing government. an accusation, at which bennett scoffed, given his own, previous