Anwar al-Awlaki’s constitutional rights were no more violated

Here's what was cited as authority to kill him:

"Lawyers for the Obama administration, arguing for their ability to kill an American citizen without trial in Yemen, contended that the protection of US citizenship was effectively removed by a key congressional act that blessed a global war against al-Qaida.

Known as the Authorization to Use Military Force (AUMF), the broad and controversial 2001 law played a major role in the legal decision to kill Anwar al-Awlaki, the former al-Qaida propagandist and US citizen, in 2011, according to a redacted memorandum made public on Monday.

"We believe that the AUMF's authority to use lethal force abroad also may apply in appropriate circumstances to a United States citizen who is part of the forces of an enemy authorization within the scope of the force authorization," reads the Justice Department memorandum, written for attorney general Eric Holder on 16 July 2010 and ostensibly intended strictly for Awlaki's case."

I think that line of thinking holds.

I also think if an American is planning or connected to planning attacks on Americans and/or American territory (endangering Americans), you have my permission to take them out.