Iran, Saudi Arabia Face Common Threat in Islamic State

Saudi Arabia will be a big part of the Obama administration's push for an international coalition to fight the Islamic State extremist group. Iran is already in that fight, backing a new government in Baghdad and helping arm the Kurds. So how does Washington balance long-standing mistrust between Tehran and Riyadh with Iran's informal cooperation against the Islamic State. VOA State Department Correspondent Scott Stearns has the story.