Defense secretary Chuck Hagel announced on Thursday that the US has a "varying" amount of confidence that the Syrian government has used chemical weapons in its ongoing civil war. President Barack Obama has repeatedly said that if Syria ever used chemical weapons it would cross a "red line". The White House sent a letter to Sens. Carl Levin, D-Mich., and John McCain, R-Ariz., on Thursday. saying that the Syrian government likely used the chemical agent sarin gas "on a small scale".
If the use of chemical weapons can be proved, does it justify US intervention in Syria? What type of proof should be required after faulty intelligence about the use of chemical weapons in Iraq? What should the "red line" be to justify US involvement?
Danielle Pletka, Vice President of Foreign and Defense Policy Studies at the American Enterprise Institute
Rudy deLeon, Senior Vice President for National Security and International Policy at the Center for American Progress