Syria: What options does US have?
30 August 2013 Last updated at 13:46 BST
A "robust response" to the alleged use of chemical weapons in Syria is needed despite UK military involvement being ruled out, the prime minister has said.
David Cameron was defeated in the Commons as MPs rejected a motion on the principle that military action could be required to protect Syrian civilians.
Jonathan Beale reports on the options open to President Obama following the UK's vote.