Colombo (Agencies): Sri Lankan Supreme Court has ruled that the exclusion of an MP from the Tamil National Alliance (TNA), the main Tamil political party, is unlawful.

The three Bench of Supreme Court on Tuesday in its ruling said the MPs expulsion from the party had not been conducted under the party constitution which needs a suitably formed disciplinary body.

MP P Piyasena's petition to the Supreme Court said he was excluded from the party without a proper probe after he voted along with the ruling party for the 18th amendment to the constitution.

The 18th amendment to the constitution lifted the two term ban on the incumbent presidents to run a third time in elections.

Piyasena who contested the last general election representing the TNA was the sole member elected from the party in Ampara district.

Several other parliamentarians from Opposition crossed over to the government benches ensuring the two third majorities in 225 member parliament, which the ruling party had hardly missed in the parliamentary election last year.

The TNA once considered as the proxies of the LTTE, scored 14 seats in Parliament.