In the
general election of 1988, the Thai Nation Party won the most votes, resulting in its leader Chatichai Choonhavan becoming the prime minister. Chatichai was the first democratically elected Prime Minister of Thailand in over a decade. Chatichai's government became known as the "buffet cabinet" for its members scrambling overtly over the distribution of public funds. The Thai Nation Party advocated a reinforcement of the role of Parliament, in which many businessmen from the province were represented who had gained wealth and growing political ambitions, vis-à-vis the traditionally powerful, but not democratically legitimised administration. Chatichai's government was deposed by a military coup d'état in 1991. The putschists accused the Prime Minister and several other members of the cabinet of having acquired "unusual wealth". After the March 1992 general election, the Thai Nation Party — now led by Air Chief Marshal
Somboon Rahong — joined a military-sponsored coalition led by the
Justice Unity Party (Samakkhi Tham), under coup leader General
Suchinda Kraprayoon. During the street protests and bloody crackdown of
Black May 1992, it was therefore considered one of the "devil parties". One of the party's factions rejected this alliance and left the party to found the
National Development Party (Chart Pattana). It was led by former Thai Nation leader and Prime Minister Chatichai. After return to democracy in 1992, the Thai Nation Party became the main opposition force against the
Democrat-led government of
Chuan Leekpai. In a 1993 representative survey, 50% of the respondents identified the Thai Nation Party as the most corrupt of the country. In 1994 Banharn Silpa-archa, a billionaire construction building contractor and "godfather of
Suphan Buri", became the party's chairman. The party won the
1995 elections that were heavily tainted with vote-buying. Banharn became Prime Minister, but his government coalition broke as early as in November 1996. After new elections, Chart Thai was in opposition against the short-lived government of
Chavalit Yongchaiyudh. In November 1997, it joined a seven-party coalition supporting Democrat Prime Minister Chuan Leekpai. ==During the Thaksin premiership==