The John Yoo interpretations of existing law during the early Bush 43 administration already did that. NDAA and subsequent updates weren't required, but I wouldn't doubt if they solidified some of the weaknesses of just having White House / NSC council interpretations.
Also, in practice, law is very subjective and frequently doesn't supply any prior constraint against government actors, only recourse after-the-fact.
Also, in practice, law is very subjective and frequently doesn't supply any prior constraint against government actors, only recourse after-the-fact.