This order upheld parliament's impeachment motion over his short lived imposition of martial law last year that sparked the country's worst political crisis in decades. 

Acting Chief Justice Moon Hyung-bae said violated his duty as president by taking actions that were beyond the powers given to him under the Constitution, and the effect of his actions was a serious challenge to democracy. 

According to the country's constitution.With Yoon's ouster, a presidential election is required to take place within 60 days.