On Tuesday President Obama applauded the U.S.-led airstrikes against the group known as the Islamic State, as the aerial attacks expanded from Iraq into Syria. The U.S. also was aiming for another militant group known as Khorasan, which officials say was plotting attacks against Americans. What is Khorasan? And what will the attacks mean for U.S. foreign policy in the region?
Steven Simon, senior fellow at the The Middle East Institute, a nonprofit think tank in Washington, D.C. He is also a visiting scholar at Dartmouth College and is the co-author of "The Age of Sacred Terror: Radical Islam's War Against America."
Fred Lawson, professor of government and the government department head at Mills College. He is author of "Global Security Watch: Syria."
Erika Solomon, Middle East correspondent for the Financial Times
Jeffrey White, defense fellow at the Washington Institute for Near East Policy