More on secret U.S. memo that made it legal to kill a citizen

From the New York Times, more on a secret legal memo from 2010 that paved the way for the assassination of Anwar al-Awlaki, an American citizen in Yemen:

The secret document provided the justification for acting despite an executive order banning assassinations, a federal law against murder, protections in the Bill of Rights and various strictures of the international laws of war, according to people familiar with the analysis.

The Obama administration memo was previously reported at the Washington Post.