U.S. News and World Report: Should America lead the world on foreign policy, follow or just sit on the sidelines? The Republican presidential candidates seem to want to make that a central issue in the 2016 election. And they have staked out an unambiguous position: America must reassert its leadership role after eight years of Obama weakness.
The Republican mantra of U.S. leadership, though, is highly selective. On Iran, the capacity of the United States to get a better nuclear deal seemingly knows no bounds. We can simply...