Mr Prompong said there had not been not much progress in the seven cases against the Democrats when compared to the case against caretaker Prime Minister Yingluck Shinawatra, who has been accused of dereliction of duty over her role in the rice-pledging scheme.
The seven cases are:
1) The orders given by then prime minister Abhisit Vejjajiva and his deputy Suthep Thaugsuban in the 2010 crackdown on red shirt protesters.
2) Alleged corruption in the construction of 396 police stations.
3) The orders of Mr Abhist and Mr Suthep to shut down satellite signals when the emergency decree was imposed in 2010, disrupting 51 websites.
4) Mr Abhisit's comment that the Democrat-led administration had a plan buy back satellite operator Thaicom when he had no authority to do so and did not inform the parliament about it first.
5) The Abhisit government's approval to issue permits for new investment projects in Map Ta Phut industrial estate which may violate the constitution's Article 67, which stipulates that companies planning projects likely to affect the environment and people's health must hold public hearings to gauge local opinion before they could proceed.
6) Mr Suthep's alleged corruption in the palm oil industry.
7) Mr Suthep, as former chairman of the National Rubber Policy Committee, allegedly allowed graft to take place in the Office of the Rubber Aid Fund.