Nauru

(1) The Supreme Court shall, to the exclusion of any other court, have original jurisdiction to determine any question arising under or involving the interpretation or effect of any provision of this Constitution.
(2) Without prejudice to any appellate jurisdiction of the Supreme Court, where in any proceedings before another court a question arises involving the interpretation or effect of any provision of this Constitution, the cause shall be removed into the Supreme Court, which shall determine that question and either dispose of the case or remit it to that other court to be disposed of in accordance with the determination. (Art. 54)

The President or a Minister may, in accordance with the approval of the Cabinet, refer to the Supreme Court for its opinion any question concerning the interpretation or effect of any provision of this Constitution which has arisen or appears to the Cabinet likely to arise, and the Supreme Court shall pronounce in open court its opinion on the question. (Art. 55)