Is there a LIMIT on Drone Killings?

Can President Obama use military drones 

to execute Americans on American 
soil without a court order?

Senator Paul asked the question and President Obama said, "I don't intend to do that." Which begs the question of whether or not he feels that it would be legal if his intentions changed.

Is there a difference between a King and a President? A president in theory has limits on his power and a King acts as God's representative on Earth -- or so most kings will claim. 

It would be interesting to wire the American President to a polygraph and ask him that question.

Is President Obama above the law? Or is the law merely what he says that it is? 

And how do we define a terrorist? Is that definition open to expansion that would allow broadened summary executions on American soil?

Violence to meet an end has been used throughout history by political organizations of both the left and the right, by nationalist and ethnic groups, and by revolutionaries. Thus the oft used phrase that one man's terrorist is another man's freedom fighter.