[KarlInOhio]

Can the President Kill You?

Let's check with thousands of Confederate troops who were killed in battle for an answer.

If you make war against the United States, the fact that you are or were a U.S. citizen shouldn't save you.

[joe fonebone]

if I recall my history, the confederates fired the first shot...

[Dead Corpse]

How about if those in control of the government make war on their own people?

What then...

[Nebr FAL owner]

The problem is that this administration & later ones will try to use this as a reason to kill “inconvenient “ people not only abroad but in downtown USA. This needs to be stopped.

[OneWingedShark]

If you make war against the United States, the fact that you are or were a U.S. citizen shouldn't save you.

From the article:
Holder argued in his speech that arresting al-Awlaki -- who has never been indicted or otherwise charged with a crime but who is believed to have encouraged terrorist attacks in the U.S.

I think the underlined portions are most relevent; there is a law against making war on the States: namely treason. (The only crime defined in the Constitution.)