Myanmar's parliamentary House of Representatives (Lower House) has formed a 15-member investigation team, headed by U Nanda Kyaw Hswa, to probe into impeachment against the Constitutional Tribunal for breaching the provisions of the constitution and the failure to discharge the vested duties, official media reported Thursday.

The Lower House's formation of the investigation team to take action against the constitutional tribunal was made after the Upper House approved on Tuesday by two thirds of the votes a proposal impeaching the Constitutional Tribunal chairman and its eight members, submitted by parliamentarian from Mandalay Constituency U Zaw Myint.

Myanmar parliament on Monday had passed a resolution by secret vote 447-168 in favor of a proposal, urging the constitutional tribunal to admit and issue statement that it had mistakenly given a verdict defining the parliament-formed committees, commissions and organizations as not the union (central) level organizations under the constitution.

The resolution was passed after 22 parliament members elected from political parties and non-elected military ones discussed the proposal, put forward by Pyawbwe constituency MP U Myint Soe on August 23.

The constitutional tribunal's verdict was given over the submission of the Attorney-General on behalf of the President on Feb. 2 asking for defining on the parliament-formed committees, commissions and organizations if they are the union (central) level organizations under the constitution.

The constitutional tribunal's March 28 verdict on the definition was first objected by 301 MPs, who jointly signed a proposal to the House of Representatives (Lower House) speaker USwe Mann, impeaching the constitutional tribunal and demanding resignation of the constitutional tribunal including its chairman and members out of own volition by August 21.

On August 24, 162 MPs with the House of Nationalities also jointly signed a petition to impeach the constitutional tribunal.

The constitutional tribunal, however, insisted on their definition verdict, thus rejecting to make resignation.

The constitutional tribunal chairperson U Thein Soe and his eight other members were nominated by the President and the two Houses' speakers, and then approved by the parliament when the new government was set up in March 2011.

The current 4th session of the parliament, held in Nay Pyi Taw, was attended by over 600 MPs of the two Houses.