[1] Thurairetnasingam was one of the Tamil National Alliance's (TNA) candidates in Trincomalee District at the 2001 parliamentary election but failed to get elected after coming second amongst the TNA candidates.
[2] However, in June 2002 he entered Parliament when he was appointed a National List Member of Parliament for the TNA, replacing M. Sivasithamparam who had died on 5 June 2002.
[2] He was one of the TNA's candidates in Trincomalee District at the 2004 parliamentary election.
[3] Thurairetnasingam did not contest the 2010 parliamentary election for personal reasons.
[5] However, after the election he was appointed a TNA National List MP in Parliament.