Isn't the issue really not whether or not an American citizen is targeted, but that our engaging in wars in the middle east is Unconstitutional since it's not for actual defense of the United States? If the war is constitutional, then I don't see the citizenship of who we target believing they are engaged in attacking America would be. And if the war is not constitutional, I don't see caring about the citizenship of who we target either, we shouldn't be doing it.
Well, I really do disagree there because I think it's vitally important that we afford US citizens some due process regardless of what they've done, or where they are. But, it's pretty juvenile to not admit that clerics preaching destruction of the US from a venue where we cannot arrest them get to play by the same rules you and I get.
However, I certainly do agree that Obama has not made the case for why we're targeting Taliban with nominal ties to US terrorism ... and I think W was clearly off the reservation too, for that matter.
So if an American citizen was in Germany assisting the Germans in WWII, you'd expect us to convict them in an American court before trying to kill them?
Now, now. I'm trying to play nice. "Due process" is a term that applies in different situations in different ways.
Legal Definition of Due Process
I think the link is correct that at the core it means "fairness." To me, fairness for the cleric, or a Nazi sympathizer in WWII Germany, would entail some notice that what he's doing is dangerous to the US, and we consider it a crime, and while we cannot extradite him, unless he desists we may take action to either extrajudically arrest him or flat out kill him. Rather than having the exec branch make this decision, I'd prefer the judiciary have some means of weighing the evidence to see if it's clear the individual is endangering us.
As for the cleric, besides having some judicial finding, imo the bastard got due process.