The politics of Saudi Arabia takes place in the context of a unitary absolute monarchy along Islamic lines, where the King is both the head of state and government. Decisions are, to a large extent, made on the basis of consultation among the King, the Council of Ministers, and the country's traditional elites. Most critics regard the Saudi government as a totalitarian state. The Basic Law of Saudi Arabia contains many characteristics of what might be called a constitution in other countries. However, The Qur'an is declared to be the official constitution of the country which is governed on the basis of Islamic law (Shari'a). The Allegiance Council is responsible to determine the new King and the new Crown Prince. All citizens of full age have a right to attend, meet, and petition the king directly through the traditional tribal meeting known as the majlis. The government is dominated by the vast royal family, the Al Saud, which has often been divided by internal disputes and into factions. The members of the family are the principal political actors allowed by the government. Political participation outside the royal family is limited. Saudi Arabia is one of only two countries (the other being Vatican City) that does not have a separate legislative body. Constitution Saudi Arabia is an absolute monarchy, although, according to the Basic Law of Saudi Arabia, Saudi Arabia's de facto constitution, adopted by royal decree in 1992, the king must comply with Sharia (that is, Islamic law) and the Qur'an. The Qur'an and the Sunnah are declared to be the de jure country's constitution. There is no legally binding written constitution and the Qur'an and the Sunna remain subject to interpretation. This is carried out by the Council of Senior Scholars, the Saudi religious establishment, although the power of the religious establishment has been significantly eroded in the 2010s. The government of Saudi Arabia is led by the monarch, King Salman, who acceded to the throne on 23 January 2015. No political parties or national elections are permitted, and according to The Economists 2010 Democracy Index, the Saudi government was the seventh-most authoritarian regime among the 167 countries rated. Government is dominated by the royal family. The King The Basic Law specifies that the king must be chosen from among the sons of the first king, Abdul Aziz Al Saud, and their male descendants subject to the subsequent approval