"Aung San Suu Kyi has complete immunity, including from being served with court documents, because under customary global law, heads of state, heads of government and ministers of foreign affairs are immune from foreign criminal proceedings and are inviolable", Porter told Reuters by email.
"She seeks support from ASEAN and other nations to provide help ... from a humanitarian and capacity-building point of view".
Singapore's Prime Minister Lee Hsien Long, the current chair of ASEAN, said there was hope the deal could be finalized this year.
Malaysian Prime Minister Najib Razak told the summit on Saturday that refugee crisis in Myanmar and Bangladesh was no longer exclusively a domestic issue for Myanmar, as fleeing Rohingya could be prime targets for terrorist radicalization. "Our goal is to support the peaceful and speedy resolution of the humanitarian. disaster that has resulted from the conflict", he said.
"We'll discuss some of the region's most pressing security challenges, including how to respond strongly and effectively to the deadly threat posed by North Korea", Australian Prime Minister Malcolm Turnbull said in opening remarks.
Mr Turnbull was pressed about the controversy at a press conference at the conclusion of the summit.
According to United Nations estimates, more than 700,000 Rohingya Muslims have fled Myanmar's northern Rakhine State to Bangladesh after the Myanmar military launched a brutal offensive in response to attacks on police and army posts by a small group of extremists known as the Arakan Rohingya Salvation Army on 25 August 2017. The campaign has included the burning of Rohingya villages, systematic rape, shootings and other rights violations.
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He was later taken to a south London police station for questioning before being released under investigation today (March 19). The telly star was involved in a collision with two other cars while he was driving his Mini in Richmond, South West London.
Unlike the United Nations, United States and Britain, Australia has not accused Myanmar of "ethnic cleansing" or "crimes against humanity".
Opposition Leader Bill Shorten also raised the plight of the Rohingya Muslims with Ms Suu Kyi at a meeting in Canberra with shadow foreign minister Penny Wong. Suu Kyi has bristled at the worldwide criticism.
Throughout her stay, Myanmar's State Counsellor has come under heavy public and private criticism over the issue.
Ms Suu Kyi has not denounced military action or addressed genocide claims.
Both leaders were asked if Malaysian Prime Minister Najib Razak was correct in saying that the Rohingya refugee crisis in Myanmar could become a serious security threat for the region.
He fears Islamic State militants could use the atrocities against the Rohingya people as a breeding ground for radicalisation.
Turnbull is under pressure to raise the Rohingya crisis when he holds a bilateral meeting with Suu Kyi on Monday.
Attorney General Christian Porter said Suu Kyi can not be prosecuted in Australia, nor arrested or detained.