President Obama has warned Syria of U.S. military action should the regime of Bashar al-Assad use chemical weapons. Speaking at the White House on Monday, Obama said any chemical warfare by Syria would be his “red line.”

President Obama: “We have put together a range of contingency plans. We have communicated, in no uncertain terms, with every player in the region that that’s a red line for us and that there would be enormous consequences if we start seeing movement on the chemical weapons front or the use of chemical weapons. That would — that would change my calculations significantly.”