The legislative branch consists of a unicameral National Assembly of 193 members who are elected every five years, and although the Malawian constitution provides for a Senate of 80 seats, one does not exist in practice. If created, the Senate would provide representation for traditional leaders and a variety of geographic districts, as well as special interest groups including the disabled, youth and women. The Malawi Congress Party is the ruling party together with several other parties in the Tonse Alliance led by Lazarus Chakwera while the Democratic Progressive Party is the main opposition party. Suffrage is universal at 18 years of age, and the central government budget for 2009/2010 is $1.7 billion.