Senator John McCain has told the US Senate that he does not believe President Barack Obama has made a final decision on arming Syrian rebels, "but he has made the decision that chemical weapons have been used".
He added: "I think it is obvious that they will be providing weapons. They need a no-fly zone."
US President Barack Obama has tip-toed over the 'red-line' and armed Syrian rebels but it is a gamble of huge proportions.
Writing for ITV News, international affairs analyst David Butter looks at the timing of US support for Syria and when it may arrive.
Are the US supplied assault rifles too little, too late and what incentive is there for Assad to enter peace talks?