"I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States".
No where does it say he/she will defend another country. Let Israel take care of Iran, they are very well capable.
Keep smoking your pot with Ron Paul as the Iranian nuke weapons are smuggled in to our country by the Mexican gangs. Enjoy the buss as millions of Americans that are incinerated.
Got many friends? How about someone who can count on you in a pinch?