There has been much discussion recently about killing American citizens waging war against their country. On Saturday, Scott Pelle from CBS News tried to debate Newt Gingrich about this issue (even though Pelle was the moderator). Also, the left has been attempting to make this an issue.
The fact of the matter is that you can lose your citizenship when you leave the country:
Unfortunetly our poorly educated press corps do not know this even though it is in their passports.