Mr Suriyasai said the government and Pheu Thai were trying to say they had nothing to do with the threats, but what they had said and done had bared their true colours.
He cited as an example caretaker Justice Minister Chaikasem Nitisiri's idea for the King to name a prime minister under Section 7 of the constitution and the Centre for the Administration of Peace and Order's statement which contained suggestions of intimidation against independent agencies.
He said the Pheu Thai-led government might have been aware that it would not be able to clear itself of alleged corruption in the rice-pledging scheme and unfair treatment in the transfer of Thawil Pliensri as National Security Council chief. Therefore, it had resorted to using rogue tactics against the Constitutional Court and the NACC.
The caretaker government and Pheu Thai could not deny responsibility for the ongoing political crisis, Mr Suriyasai said.
He said the Green Group was gathering evidence to file against the Pheu Thai Party with the Constitutional Court, seeking its dissolution and the banning from politics of its executives.