Where?
Iran is seeking war. Period. Why wait until they are able to strengthen themselves? Why give them money and license to arm themselves? Why give them free reign to terrorize the world with impunity? Why should America's president be the next Chamberlain (or worse)?
Best case we could hope for is regime change. We bungled a few chances under Obama, as Obama and the European bureaucrats like the Mullahs better than the Iranian people, apparently.