Democrat Party's leader Abhisit Vejjajiva announced Sunday that his lawmakers will resign en masse.
Abhisit said Pheu Thai and the government have never taken responsibility for passing the controversial Amnesty Bill. Moreover the government declared that it will not accept the Constitutional Court's ruling on the charter amendment.
Abhisit, a former prime minister, said the declaration is not acceptable.
He also questioned Prime Minister Yingluck Shinawatra's latest offers to dissolve the House and hold a public referendum.
He said Yingluck is not sincere in making the offers and distorted the information to make people think his party was the cause of the coup d'etat in 2006.
Therefore, after reviewing all circumstances and incidents, the party decided that all party MPs will resign en masse with immediate effects.
Abhisit added that tomorrow, we as Thai citizens, will use their basic rights to protect the constitution.