President Obama has drawn a line in the sand regarding the use of non-conventional weapons in the escalating conflict in Syria.
Obama warned the threat of chemical or biological warfare would force his administration to take military action.
"I have not at this point ordered military engagement in this situation," the president told reporters at a news conference Monday. "But to the point you made about chemical and biological weapons, is critical. That is an issue that concerns Syria."
"It concerns our close allies in the region, including Israel," he continued. "It concerns us. We cannot have a situation where biological or chemical weapons are falling in the hands of the wrong people."
"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 change my calculations significantly," he said.
Syria is believed to possess stockpiles of chemical and biological weapons, including Sarin and mustard gas. It has threatened to use them if the country comes under foreign attack.