Obama says he didn't set a red line, the world set a red line

US President Barack Obama has said that he "didn't set a red line" over Syrian intervention, but that "the world set a red line".

The President said that his "credibility is not on the line" on Syria, having offered Congress a vote on further action, scheduled for 9 September.

Obama believes that Congress will approve authorisation for military action, saying that a "real strong message" must be sent to Syrian ruler Bashar al-Assad in order to "degrade" his ability to use chemical weapons again.