By Chris Lawrence, Elise Labott and Tom Cohen
Few question that there was a major chemical attack in Syria last week, and the United States has made clear that it blames the government of President Bashar al-Assad.
Now, the question is how President Barack Obama will respond.
For almost two years, Obama has avoided direct military involvement in Syria's civil war, only escalating aid to rebel fighters in June after suspected smaller-scale chemical weapons attacks by Syrian government forces.
However, last week's attack on a Damascus suburb that reportedly killed and wounded more than 3,000 people obliterated the "red line" Obama set just over a year ago against the use of Syria's chemical weapons stocks.FULL STORY