Israel has been rocked to its core by Hamas’ brutal surprise attack. At least 1,000 people have been killed in Israel since the start of the Hamas assault, Meantime the Palestinian Health Ministry says the death toll in Gaza is now more than 800, with more than 4,000 injured. The fighting continues to rage on, with the UN calling the latest developments "bone-chilling."

Ehud Barak was Israel’s prime minister from 1999 to 2001. Before that he was Israel’s defense minister for nearly six years. Barak tells Christiane why the Hamas attack was “the most severe blow” in Israel’s “entire existence.”

Also on today's show: Abbey Onn, a relative of five of the Israeli's being held hostage; Khamis Elessi, a doctor in Gaza; Imran Ahmed, CEO, Center for Countering Digital Hate; John Kirby, National Security Council Coordinator for Strategic Communication

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Shock, trauma, and the agony of uncertainty