President Barack Obama said yesterday that most leaders of the G20 countries agree that Syrian President Bashar al-Assad is responsible for using poison gas against civilians as the US leader tried to rally support at home and abroad for a military strike.

Obama said he planned to speak to the American public about Syria on Tuesday as Congress considers his request for limited military action in Syria.

Speaking to reporters at an international diplomatic summit, Obama said the leaders of the world’s largest economies agreed that chemical weapons were used in Syria and that the international ban chemical weapons needs to be maintained.

However, he said there was disagreement about whether force could be used in Syria without going through the United Nations.

The majority of the room is comfortable with our conclusion

The US has been unable to win UN Security Council approval for military action against Syria because of the opposition of veto-wielding Russia.

“The majority of the room is comfortable with our conclusion that Assad, the Assad government, was responsible for their use,” he said at a news conference, adding that this is disputed by Russian President Vladimir Putin.

A number of countries believed that any military force needed to be decided at UN Security Council, a view he said he does not share.

“Given Security Council paralysis on this issue, if we are serious about upholding a ban on chemical weapons use then an international response is required, and that will not come through Security Council action,” he said.