A day after the formation of a new Tunisian government, five ministers from the national unity government resigned Tuesday, undermining hopes of a viable power-sharing agreement between longstanding allies and opponents of ousted Tunisian strongman Zine al-Abidine Ben Ali.

Three ministers allied with the UGTT (General Union of Tunisian Workers) announced their resignations after the country’s largest union refused to support the new national unity government, which contains eight ministers who served under Ben Ali.

Labour Minister Houssine Dimassi, junior Transportation Minister Anouar Ben Gueddour, and Abdeljelil Bedoui, a minister without portfolio, quit following an extraordinary UGTT meeting Tuesday. Education Minister Taieb Baccouch also resigned. According to the Associated Press, Health Minister Mustapha Ben Jaafar of the FDLT opposition party had also submitted his resignation.

Under Ben Ali’s 23-year reign, a number of political parties were banned and several opposition figures went into exile. In the lead-up to formation of the new national unity government, a number of banned opposition parties were not included in the coalition talks.