US presidential candidate Barack Obama has told a pro-Israel lobbying group, that he is committed to protecting the security of Israel.
In his second formal foreign policy pronouncement, the Democrat senator, also called Iran's President Mahmoud Ahmadinejad's regime 'a threat to all of us'.
Mr Obama, a member of the US Senate Foreign Relations Committee, said that aggressive diplomacy combined with tough sanctions should be the primary means to prevent Iran from building nuclear weapons.
However, he added that a military option should remain on the table.
