US and France have said that they could not "tolerate" chemical weapons being used in Syria. In a phone call to President Hollande, Mr Obama said that they want to send Assad a "strong message" over the use:
The two leaders agreed that the international community cannot tolerate the use of chemicals weapons and must hold the regime accountable and send a strong message that the use of chemical weapons is not acceptable.
The United States and France are close allies and friends, and we will continue to consult closely with France on Syria and other global security challenges.
The US is considering a "limited act" in response to the alleged use of chemical weapons by the Syrian army, but how will Assad respond?
Will America go it alone in Syria after the Government's defeat in the Commons last night? The answer is yes. Emphatically yes.
As the West wakes up to another day, it is not just Prime Minister David Cameron who has a Syria problem - so does President Barack Obama.