The Navajo Nation is a non-IRA5 tribe and is not governed by a written constitution. The Navajo Nation government consists of a three-branch system. The nation has a six volume, twenty-four title6 code. Title II outlines the administration of tribal affairs, including the executive and legislative branches. Title VII outlines duties of the judiciary. The modern Navajo Nation government is best described as a western / traditional blend of governance.
Becker, Navajo Nation, Bidtah N.. "Profile of the Law of the Navajo Nation." Tribal Law Journal 0, 1 (1999). https://digitalrepository.unm.edu/tlj/vol0/iss1/2