With the May 16 coup of Park Chung-hee in 1961, the 1960 version was nullified, and in 1962, the Third Republic's Constitution was passed. This document returned to a presidential system. It had a number of similarities to the United States Constitution, such as nominal judicial review functions. In 1972, Park extended his rule with the Fourth Republic constitution, called the Yusin Constitution, which gave the president sweeping (almost dictatorial) powers and permitted him to run for an unlimited number of six-year terms.