A court in Thailand on Wednesday removed Prime Minister Srettha Thavisin from office over an ethical violation, further shaking up Thai politics after it ordered the dissolution of the main opposition party a week ago.

The Constitutional Court ruled on a case involving Srettha’s appointment of a Cabinet member who had been jailed in connection with an alleged attempt to bribe a court official.

The court voted 5-4 against Srettha and the ruling removed him from office immediately.

The Cabinet will remain in place on a caretaker basis until Parliament approves a new prime minister. A vote was scheduled by Parliament on Friday, but it has no time limit for filling the position. The caretaker Cabinet could also dissolve Parliament and call a new election.

Srettha, speaking at Government House shortly after the verdict, thanked the judges for giving him the opportunity to defend himself. He said he respected the ruling and that he always sought to act ethically during his time in office, which was less than a year.

The acting prime minister is expected to be Phumtham Wechayachai of Srettha’s Pheu Thai party. Phumtham was first deputy prime minister and commerce minister under Srettha.

The Constitutional Court last week ordered the dissolution of the progressive Move Forward Party, which won last year’s general election, over an accusation that it violated the Constitution by proposing an amendment to a law against defaming the country’s royal family. The party has already regrouped as the People’s Party.

The petition against Srettha was initiated by former members of the military-installed Senate who had refused to approve Move Forward’s prime ministerial candidate when the party was attempting to form a government after its election victory. It was seen as a move favoring a pro-military political party in his coalition government.

Thailand’s courts, especially the Constitutional Court, are considered a bulwark of the country’s royalist establishment, which has used them and nominally independent state agencies such as the Election Commission to issue rulings to cripple or sink political opponents.

The Constitutional Court’s rulings are “two judicial coups” that are “against international standards and upset the usual checks and balances in a democratic system,” said Prajak Kongkirati, a political scientist at Bangkok’s Thammasat University.