She added: “I think that his strongest capability in Israeli society is his rhetoric.”
The former adviser added that the Israeli Prime Minister “manages to reach out to a much broader base than you think.”
Earlier this week, Mr Netanyahu warned that replacing him would endanger the country’s “security and future”.
He also accused adversary Naftali Bennett of “misleading the public” over a proposed cooperation around his hardline Yamina party.
Israel’s longest serving PM added: “What impact will that have on Israel’s deterrent capability?
“How will we look to our enemies? What will they say in Iran and Gaza?
“Don’t form a left-wing government. Such a government is a danger to Israel’s security and future.”
Mr Netanyahu has spent more than a decade in office.