A new video surfaced Tuesday that appears to show the brutal execution of Steven Sotloff at the hands of ISIS.
The video includes a direct warning to President Barack Obama, telling him, "Just as your missiles continue to strike our people, our knife will continue to strike the necks of your people."
Last week, President Obama said the U.S. does not "yet" have a strategy to deal with ISIS in Syria. Administration officials say ISIS poses a "very serious threat to the homeland."
British Prime Minister David Cameron announced a series of measures to combat the threat of ISIS within the U.K.
Where is the President's strategy?
OutFront, Democratic Congressman Chris Van Hollen.