Sorry, folks, but I think there's a fundamental flaw with this whole story. First of all, I don't believe there is any law or directive that legally permits the President of the United States to knowingly kill a US citizen without due process. I think too many folks in here have been watching too many government conspiracy movies like Enemy of the State, Shooter, The Bourne Identity or any number of movies that seem to take it for granted that this is how the Government acts.
There is a fundamental difference between taking out a legitimate target whether or not a US citizen happens to be there and specifically marking a US citizen for assassination. In the first instance, the target is a location (e.g. terrorist training camp, bio-weapons development facility, enemy headquarters, etc.) and all persons located there run the risk of being blown up by a smart bomb or being taken out by a team of commandos. However, in the second case, the President or other government official would have to deliberately bypass the Constitution and essentially commit murder. Sorry, but that just doesn't happen no matter what you see in the movies.
Makes for great conspiracy theories. Makes for even better action movies, especially with Jason Statham, Jet Li, Clive Owen or other similar action star in it. But it does not happen in the real world.
I'm surprised that Kucinich would swallow the bait into believing that there needs to be a bill introduced in Congress when he should call for an investigation to determine if it's happening at all. If it is, there are already laws in place to press criminal charges against those involved.