Here is what Lieberman might say to Netanyahu in his own defense, which is not totally devoid of merit: The Netanyahu government never held a discussion on its policy. When the Cabinet was formed (2009), Likud was for "no Palestinian state, only Autonomy", while Lieberman's party was for the "exchange" idea he described at the UN. Four months after the elections, Netanyahu gave a speech supporting the "two states solution". However, that speech was not brought for discussion before the cabinet, nor was it even discussed before Likud (because Netanyahu wants to avoid disagreements). In Israel, the Cabinet shares "joint responsibility". A PM's decision does not create a Cabinet decision or authority. With Netanyahu avoiding a Cabinet discussion on their new policy regarding the Palestinians, the end result is that there is NO official policy. Hence, Lieberman could rightly claim that his speech was not in contradiction to Israel's policy. In this he will be right. Of course, he is publicly embarrassing a dysfunctional cabinet and is contemptuous towards his PM, but that is all that one could blame him for.
from the article: Fire Lieberman