"I have resisted calls for military action because we cannot resolve someone else's civil war through force, particularly after a decade of war in Iraq and Afghanistan," he said.
"The situation profoundly changed, though, on August 21, when Assad's government gassed to death over a thousand people, including hundreds of children."
Explaining his plans to order a targeted air strike in response, Obama said there was no doubt that a deadly nerve gas attack took place, and listed evidence of the Syrian regime's responsibility. "The facts cannot be denied," Obama said.