Whats the problem? I've known that America has been eliminating "Americans", since I was 17 years old, and on my 1st tour in Vietnam. If you think about it, the government was eliminating Americans in the Revolution... Before and After the Constitution was written.
For all of the bluster about "rights"... The rights end when one becomes a traitor to the nation.
But how do we get from point A, someone suspected of being a traitor, to point B, proof the suspect is indeed a traitor, where his loss of freedom or life is sanctioned.
Ideally the conduit between points A and B is due process.
The issue becomes more complex as the Administration maintains there is due process, albeit internal and not subject to public scrutiny.
The question, therefore, isnt a lack of due process per se, but is the due process afforded terrorist suspects by the Administration sufficient. We know from
Boumediene v. Bush (2008), for example, that the due process provided by Congress in the Detainee Treatment Act of 2005 was not adequate, and the provision was invalidated. But that ruling pertained to terrorist suspects in US territories, in this case Guantanamo Bay, Cuba. No court has ruled as to what constitutes adequate due process with regard to assassinations on foreign soil, regardless nationality of those targeted and we likely never will have such a ruling.