Iraq

First: This Constitution is the preeminent and supreme law in Iraq and shall be binding in all parts of Iraq without exception.
Second: No law that contradicts this Constitution shall be enacted. Any text in any regional constitutions or any other legal text that contradicts this Constitution shall be considered void. (Art. 13)

Each region shall adopt a constitution of its own that defines the structure of powers of the region, its authorities, and the mechanisms for exercising such authorities, provided that it does not contradict this Constitution. (Art. 120)

Existing laws shall remain in force, unless annulled or amended in accordance with the provisions of this Constitution. (Art. 130)

Legislation enacted in the region of Kurdistan since 1992 shall remain in force, and decisions issued by the government of the region of Kurdistan, including court decisions and contracts, shall be considered valid unless they are amended or annulled pursuant to the laws of the region of Kurdistan by the competent entity in the region, provided that they do not contradict with the Constitution. (Art. 141)