There absolutely is a case. I was not meaning to imply that there wasn't. I was meaning specifically to address the idea that the rights of a sovereign nation can be invoked to decide whether any particular action legal under the laws of the United States.

As long as the USA remains a country that is bound by rule of law rather than rule of dictate, one can't reasonably argue with due process simply by invoking the fact that the USA is a sovereign nation, because the US government is comprised of more than just its executive leadership. The executive branch is bound by laws as drafted by the legislative branch and interpreted by the judicial branch.