Iran will be watching how Obama handles Syria: expert Barack Obama may have to act on Syria if further evidence shows the Assad regime used chemical weapons, since the US president's credibility will be at stake and other adversaries like Iran and North Korea will be watching. So says Wilson Center Vice President Aaron David Miller, a Middle East expert and former advisor to six secretaries of state. Miller spoke to AFPTV about Washington's possible course of action now that intelligence shows probable use of chemical agents during its civil conflict. Images and soundbites.