 The NAP later filed impeachment proceedings with the National Counter Corruption Commission (NCCC) against Prime Minister Chuan Leekpai and the Minister of Finance Tarrin Nimmanahaeminda for violation of the Constitution.The NAP argued that the letter of intent that the government signed with the International Monetary Fund (IMF) to secure emergency financial support was a treaty, and that Article 224 of the Constitution stipulated that the government must receive prior consent from Parliament to enter a treaty.The NCCC determined the issue concerned a constitutional interpretation and petitioned the Constitutional Court for an opinion.