The influential US senate has approved the use of military force in Syria, in response to reports of a chemical weapons attack there.
The group of politicians approved a plan that allows the US to use military force in Syria for 60 days, as long as it doesn't involve sending US troops in on the ground.
President Obama says he'll continue to press Russia to support military action against its ally, Syria, when world leaders meet at the G20 summit in Russia later today.
All week world leaders have debated whether or not to take military action in Syria after the government there was accused of using chemical weapons against its own people.
Russian President Vladimir Putin has warned the US and its allies against taking action without UN approval, saying it would be "an aggression".
Two million Syrians have already fled their homes to seek safety in neighbouring countries.
In a statement at the White House on Saturday, President Obama said he felt it was important to have a debate about intervention in Syria.
"I've long believed that our power is rooted not just in our military might, but in our example as a government of the people, by the people, and for the people.
"And that's why... I will seek authorisation for the use of force from the American people's representatives in Congress," he said.