The White House said Thursday in a letter addressed to John McCain and other lawmakers that it believed the Syrian government has used chemical weapons on a small scale in its civil war, reported multiple news sources.
President Obama is forced with a decision after stating many times that if the Syrian government crossed "the red line" the U.S. would step in, reported The New York Times.
The White House said it would need more conclusive evidence, alluding to the faulty intelligence that lead to the Iraq War, reported The New York Times.
In Jerusalem last week, President Obama said it would be a "game changer" in U.S. involvement if such weapons had been used, reported The New York Times.
The U.S. conclusions followed those of Britain, France and Israel, which have suggested in recent days that forces loyal to Assad have probably used sarin, reported The Washington Post.