Lieberman issued the 'silence recommendation' so that he appears to be the only leader who cares about the real issues. He tells every politician not to talk about Lebanon: it is a matter of national security, through the foreign ministry he controls. Then, as the cabinet ministers do their national duty, Lieberman speaks up and affirms "I am the only Israeli leader who cares about the issues! No one will speak about the crises that threaten Israel, but I will! I will be the only Israeli that defends Israel!" Which only foreshadows the degree of unethical behavior the leadership of Israel under Lieberman would face.
Justice Ministry: Information examined by AG about Gal Hirsch didn't come from police (Haaretz)