I guess you and those lawyers and advisers and the "Constructional Scholar" obama himself never heard of DUE PROCESS.
The Constitution states only one command twice. The Fifth Amendment says to the federal government that no one shall be "deprived of life, liberty or property without due process of law." The Fourteenth Amendment, ratified in 1868, uses the same eleven words, called the Due Process Clause, to describe a legal obligation of all states. These words have as their central promise an assurance that all levels of American government must operate within the law ("legality") and provide fair procedures. Most of this essay concerns that promise. We should briefly note, however, three other uses these words have had in American constitutional law.
Due process | LII / Legal Information Institute