“We decide to nominate Paetongtarn Shinawatra,” party secretary-general Sorawong Thienthong told a press conference in Bangkok.

Lawmakers will vote tomorrow in parliament – where Pheu Thai heads a governing coalition – on whether to approve Paetongtarn as prime minister.

The vote comes after Thailand’s constitutional court sacked premier Srettha Thavisin yesterday after ruling he had breached regulations by appointing a cabinet minister with a criminal conviction.

Srettha was the third prime minister from Pheu Thai to be kicked out by the constitutional court and leaves office after less than a year.

Thai politics has endured two decades of chronic instability marked by coups, street protests and court orders.

Much of it has been fuelled by the long-running battle by the military and pro-royalist establishment against progressive parties linked to Thaksin.