A new constitution was promulgated in 1980. The old ceremonial post of president was abolished, and the head of government became the executive president, chosen, as the former position of prime minister had been, by the majority party in the National Assembly. Burnham automatically became Guyana's first executive president and promised elections later in the year. In elections held on December 15, 1980, the PNC claimed 77 percent of the vote and forty-one seats of the popularly elected seats, plus the ten chosen by the regional councils. The PPP and UF won ten and two seats, respectively. The WPA refused to participate in an electoral contest it regarded as fraudulent. Opposition claims of electoral fraud were upheld by a team of international observers headed by Britain's Lord Avebury.