I seriously doubt if Obama will do anything beyond urging sanctions be adopted via the UN. There is no chance the US would attack Iran or back Israel in such an attack. I'm afraid Israel is totally alone with this. As someone who supports peace with almost all enemies I am conflicted on the Iran issue. I feel strongly that Iran cannot be allowed to develop nukes because I fear they will use them but don't want any more wars for the US or Israel. This is the problem of the century.
Knesset passes 'Norwegian Law' allowing ministers to resign their seats, remain in cabinet (Haaretz)
from the article: U.S. warns Iran: Meet nuclear obligations or face 'next step'