Despite overwhelming US military might, Iran campaign would pose complex challenges

With a massive US military buildup in the Middle East, and prospects for a diplomatic breakthrough looking fairly grim, an American operation against Iran might finally be around the corner. Top US officials, including Secretary of State Marco Rubio, continue to insist that diplomacy remains US President Donald Trump’s preference. Trump himself said as much during his State of the Union address on Tuesday — but he also promised ominously, “one thing is certain: I will never allow the world’s number one sponsor of terror — which they are by far — to have a nuclear weapon. Can’t let that…