ECT challenges Supreme Court’s authority to examine Senate candidate qualifications

The Election Commission of Thailand (ECT) has sought a Constitutional Court ruling over the Supreme Court’s authority to examine the qualifications of Senate candidates, amid a controversy over the Senate selection fraud.

The ECT commissioners voted 5-2 to petition the Constitutional Court, asking it to rule whether the Supreme Court had the authority to examine the qualifications of five Senate candidates, two of whom are sitting senators, according to several news outlets.

Three petitions were filed with the Supreme Court by unsuccessful Senate candidates, known as reserve senators. They asked the Court to examine the qualifications of five Senate candidates who had passed the preliminary qualification examination conducted by the ECT. The ECT had judged that these candidates were eligible after an earlier petition filed over their qualifications. 

The Supreme Court began reviewing the evidence in October 2025. The Court is expected to conclude the case by the end of this year. 

However, the majority of the ECT commissioners claim that by accepting the petitions, the Supreme Court has infringed on the ECT’s authority to oversee the Senate selection process, particularly as these candidates had been officially cleared by the commission. 

According to the ECT, the Supreme Court has no authority to initiate on its own the process to revisit the ECT’s final decision. 

On 4 November, the ECT filed its petition with the Constitutional Court. The ECT argues that the law narrowly defines the Supreme Court’s jurisdiction, and gives it no authority to initiate investigations into electoral fraud, except in cases referred to the Supreme Court by the ECT itself. This includes the case in which the ECT referred to the Court the case of 77 individuals allegedly involved in Senate selection fraud.

The case is not merely a dispute over the Senate candidates’ qualifications, but also an institutional power struggle.

The 2017 Constitution was designed to give to the Senate the power to approve appointments to the Constitutional Court and high-ranking positions in several other independent agencies. There has always been a question of how independent these institutions can be when the Senate has this authority.

4 out of the 7 incumbent Election Commissioners were approved by the current Senate, as were 2 of the 9 current Constitutional Court judges. The remaining 7 judges, who were approved by the military junta, will leave office in 2029, and their successors will also require the Senate’s approval.

Meanwhile, the Supreme Court is one of only three institutions whose judges are not approved by the Senate. Yet it is being challenged by an institution whose commissioners were approved by the Senate before a tribunal also approved by the Senate.

All eyes are now on how the Constitutional Court will respond.