Thailand's Constitutional Court on Wednesday dismissed Prime Minister Srettha Thavisin for appointing to his cabinet a former lawyer who served jail time, raising the specter of more political upheaval and a reset of the governing alliance.

Real estate tycoon Srettha becomes the fourth Thai premier in 16 years to be removed by verdicts by the same court, after it ruled he violated the constitution by appointing a minister who did not meet ethical standards.

Srettha's removal after less than a year in power means parliament must convene to choose a new premier, with the prospect of more uncertainty in a country dogged for two decades by coups and court rulings that have brought down multiple governments and political parties.