The TNA MP and party spokesperson, M A Sumanthiran on Sunday stressed the unity government was essential if the constitution making process was to proceed.
His comments, which were made to reporters following a Thai Pongal celebration at the party office in Colombo, echoed that of TNA leader Mr Sampanthan.
Mr Sumanthiran added that investigations in corruption should not cause the unity government to end.
"It does not mean that investigation on corruption should stall; they must carry on; but those issues must not cause the Unity Government to fall. Many progressive changes were made possible because of the national government of the two main parties," Mr Sumanthiran was quoted by the Daily News as saying.