It starting to look like a very wise idea to obtain dual-citizenship. Which is suprisingly easy in most EU contries if you can document that one of your parents or grandparents held citizenship there and not terrible difficult even if you can’t (there are entire websites devoted to the topic). Even if the IRS revokes your US passport, you are still free to obtain and travel on a passport from the country you have dual-citizenship in.
You do realize that there is no such thing as dual citizenship with another country, if you are a US citizen?
Part of the naturalizing oath a new citizen takes is "renouncing all others".
This is why Obama's foreign parentage is such a big deal. He still has Indonesian citizenship through his stepfather. With that intact, he could in good faith take the oath to be naturalized a US citizen. So I conclude he is a foreign enemy.