I'm in Brazil and I'm going to Australia. The best price is going with connections in the USA. I did the ESTA but I've answered that I had been in Iran in 2015 and automatically answered me that I was not allowed to have the ESTA. I know that I can try it again. My doubt is the following one:
-I entered Iran with my old brazilian passport. To do the ESTA I'm using my italian passport that have no stamps at all. I'm going to use my brazilian passport just to leave brazil, after that I'm only using my italian passport. Will I have a problem if I apply the ESTA again answering that I haven't been in Iran? Do they have some kind of link between my passports? If I do this should I answer that I have only this italian passport in the ESTA application?