Ever since the United States, alongside Israel, went to war against Iran in late February, U.S. President Donald Trump has struggled to define the objectives of the conflict. His emphasis has shifted from demands for regime change to degrading Iran’s military to securing safe passage through the Strait of Hormuz. Most frequently, he has seemed to emphasize a need to roll back Tehran’s nuclear program. It is an odd frame for a war that has barely touched Iranian nuclear capabilities, but a fitting one for a leader who withdrew from President Barack Obama’s 2015 nuclear deal with Iran, the Joint Comprehensive Plan of Action, in 2018 and claimed a year ago to have “obliterated” Iran’s program.…