If an insurrection had the goal of replacing our corrupt leaders who use government to commit illegal acts, Obama would not have the legal authority to use drones to attack the rebels. Government loses all legal authority, and laws cease to have meaning, when those tasked with law enforcement violate the laws they are charged with protecting and enforcing.
That is tyranny, and tyrants hold no legal authority over the free and sovereign people of the United States, as protected under our Constitution. Such tyrants form governments of men, not laws, and must be eliminated if a lawful and legitimate government is to be reinstated as required by the Constitution (law, not men).
Authoritarians hold no "legal" authority. They're authoritarians. They are the "law," such as it is. There is no measure of "legal" under such a system, only the will of the autocrats. You could call their will the "law" and say they had absolute "legal" authority, but those would be redefining those words.
This is why I'm not fixated on the specific language used. They're lawyers and politicians. They're liars. They stretch words and mislead worse than I ever legally could, and I'm in advertising.
The point is that he (Holder, Obama, anyone from the administration) does claim legal authority to do it, and he does not limit it specifically to combating insurrection.
The point is that Obama claims the legal right to bomb American citizens in America, a power not granted to him under the Constitution. Holder only said no to a very specific question. He left the door open to armed drone strikes on the American people far beyond anything the Constitution grants for defense of legitimate government against armed rebellions.
The framers of the US Constitution dealt with insurrection between their war of rebellion and the formation of their constitution. The Constitution legally permits the executive branch defend its sovereignty against internal threats. The Obama administration claims the legal authority to do far more than defend itself against internal threats. Did Holder point to the Constitution and the specific powers it gives the executive branch? No. Did he point out that the Obama administration believes it has those powers specifically, and no more or less? No. He left the door open to far more activity than is granted in the Constitution. He claims far more authority than is granted in the Constitution.
Holder is an attorney working as the top lawyer for a president who is a legal scholar. Obama and Holder didn't refer to the powers granted to them in the Constitution to clarify what powers they claimed to have, because they claim more powers than it grants them. Of course they didn't say outright "we want to be able to bomb Americans who are a threat to us politically." They'll never say that, even when they do it.
But they didn't rule using drone strikes to eliminate political enemies which they can broadly interpret the Constitution to define as "imminent threats" to the United States. People in the media exposing corruption and tyranny could motivate people to resist tyranny. To resist government. That could be viewed as an imminent threat. Media voices could be silenced with drone strikes constitutionally, by that broad reading. They'd be combatants, sort of. They'd be threats.
And Obama and Holder won't rule it out, despite a month and a half of pressure from members of the legislature and years of pressure from sovereign Americans. (Many protested the Bush policies which paved the way for what Obama is doing now.)
Einstein, I wasn't aware of Holder's latest testimony. It had nothing to do with a URL. I wasn't up to date on the subject. Learn to read. You're embarrassing yourself. Again.
As The Great Eye points out, I'm arguing that there's much more significance to this topic than just Obama and Holder refusing to say who they think they have the legal authority to bomb with drones, and that there's much more significance to their delaying saying the tiny bit that they have. He disagrees. So we're talking about it. Neither of us expects to convince the other of the wisdom their position, but it's good to state and read the best cases for a position.
This stuff isn't complicated. Maybe you can learn something from it.
The Yell, Holder didn't limit the legal authority to bomb Americans he claims the administration has to what you're referring to. He claims more. That he is legally permitted to do less than he claims is irrelevant. 
[I wish I could obey forum rules]