The spokesperson for the Tamil National Alliance (TNA) reiterated the party's view that an justice mechanism examining mass atrocities committed in Sri Lanka must include international judges.
"There is no compromise on the view that an investigation on war crimes and human rights violations in Sri Lanka's war must include international judges as a necessity," the TNA said in a statement published on its website on Friday.
"The Tamil National Alliance has pointed out that there is no constituitional barrier to conducting an investigation which includes international judges," he added.
Mr Sumathiran urged however that if there is any perceived barrier to the inclusion of foreign judges in any domestic investigation then for the government to remove this.