I don't see a problem with dual citizenship. Lots of legal immigrants come here to study or work, get citizenship, contribute to development, pay taxes and then go back to their country of birth for whatever reason. I agree having someone with dual citizenship in an important government post at best looks bad, especially when it's with country that polarizes opinion as much as Israel. You can't imagine someone holding citizenship from China or a predominantly Muslim country would ever do that job. Or even France. C'est la vie.