The president's son-in-law addressed the Israeli-Palestinian conflict.
Prime Minister Benjamin Netanyahu will speak to the forum by video.
Speculation at this year’s forum will focus on whether there will be a rapprochement there between bitter rivals Barak and Ashkenazi.
Ya’alon came under criticism for implying that the US policy in Syria was less than perfect and created a vacuum.
Democratic front-runner speaks day after Kerry made headlines by warning that Israel was in danger of becoming a bi-national state.
Naftali Bennett gave a spirited performance at the recent Saban Forum, but was far more convincing on what should not be done, than on what should be done.