Jon Alterman, a senior vice president at the Center for Strategic and International Studies, said Iran's willingness to meddle in the Middle East also requires Trump to consider this: "How do you escape a dynamic whereby Iran keeps doing cheap, asymmetrical things that force you to do expensive things?"
"What's strikes me most is how different our concept of war was seven years ago," he said. "We are engaged in a whole series of infinitely sustainable, low-level actions that have no logical endpoint. When do we stop doing drone attacks in Yemen and Pakistan? What level of terrorism is acceptable? ... We're engaged in battles with a whole range of groups that are never going to surrender, so how do you decide to stop it? How do you decide what winning looks like?"