 Complete the following phrase:  He seized power as head of the army during a bloodless coup against President Abdus Sattar on 24 March 1982 by imposing martial law and suspending the Constitution. He declared himself President in 1983, and subsequently won the controversial 1986 Bangladeshi presidential election. Despite claims to have legitimately won the 1986 election, many consider his regime as an era of military dictatorship. Ershad served in the Presidential office until 1990, when he was forced to resign following a popular 