What should the United States do about Iran? 

This has been among the most important and urgent questions on U.S. national security over the past four years. Barack Obama began his presidency with a series of conciliatory gestures, nearly all of which were rejected (or mocked) by the Iranian regime. The president’s rather accommodating approach has given way to a slightly more assertive U.S. posture, albeit one driven more by the international community and the U.S. Congress than the White House. And over the last four years, the one consistent message from the Obama administration to the Iranian regime has been unmistakable: We don’t want a war.