A huge political battle is looming in Washington over the nuclear agreement with Iran. In the short run, Barack Obama will win the fight with his opponents in Congress. But in the long run, the fate of the deal, his legacy, and perhaps the future of American foreign policy, will be decided by forces operating beyond his control.
Anyone critiquing the agreement seemingly has an abundance of riches. It can be attacked as insufficient on inspections, rolling back Iran’s nuclear development, excessive sanctions relief (especially eventually lifting the UN arms embargo), and not accounting for what happens after its restrictions expire. But none of that is sufficient.