The argument Leiberman made today on Cavuto was that during WWII, even native-born American citizens were stripped of their citizenship if they went to Germany and joined the Nazi army. This Times Square bomber (or any other American citizen that joins a terrorist group) is doing the same thing as an American in WWII joining the German army. A similar law according to him is already on the books, except that it assumes a foreign nation-state would be the declared enemy — and so doesn’t cover the War on Terror as written.
I’d be happy to try them and hang them for treason, myself, but there is no denying they’ve given their allegiance to something other than the USA.
And there is good reason for that.
As should any American who joins a terrorist group that is at war with this country.
However, how would you like to be stripped of your citizenship because sister Janet decides that your local Tea Party group falls within her arbitrary definition of what a "terrorist group" is?
This is why I said that Joe Lieberman should tread carefully.