On Saturday, the militant group Islamic State in Iraq and Syria (ISIS) released a video showing yet another hostage execution. The latest victim: British aid worker David Haines. It’s the third beheading of a captured western hostage since the U.S. began airstrikes Aug. 8 in Iraq. British Prime Minister David Cameron reacted to news of the killing by vowing to “hunt down those responsible and bring them to justice.” Secretary of State John Kerry is in France today meeting with European and Arab leaders from more than 20 countries about building a coalition to confront ISIS. Guest host Frank Sesno and guests discuss the U.S. fight against the Islamic State and the extent of Arab and European government support.