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If the world powers are not prepared to insist that Iran change its behavior before a deal is signed, at the very least they should insist that Iran change its behavior before a deal expires.

Benjamin Netanyahu addresses a joint session of the US Congress, time.com. March 3, 2015.
If the world powers are not prepared to insist that Iran change its behavior before a deal is signed, at the very least they should insist that Iran change its behavior before a deal expires.