The US Senate Foreign Relations Committee is like to vote later this evening on a draft resolution authorising the use of military action in Syria.
Republican Senator Bob Corker told Reuters he sensed the panel vote will take place later, but that discussions are to continuing.
Obama made a personal appeal to the international community to unite in military action against 'barbarism' in Syria.
President Obama has received the support of prominent Republicans as he tries to gain backing for military action in Syria.
President Obama and his team are engaged in frenzied lobbying as lawmakers prepare to vote on a possible military strike in Syria.