Except China and Russia both Nuclear powers have already said they would help Iran.
Anyways the USA needs to stay out of it whatever happens as Israel does not have any resources the USA needs, or even if they do USA ,, the USA could get it elsewhere. The problems those countries have with each other they will always have and nothing will change that no point in intervening in some conflict that will never end, lets take care of our own Problems, Homelessness, Crime, Drugs and the countless Deaths that come with Drugs, Corruption etc.. Once we get rid of ALL the problems in the USA, then work on other Countries problems andv way to find peaceful solutions for them.