Addressing a seminar organised by the National Human Rights Commission (NHRC), Singh asked why some people were objecting to the deportation of Rohingyas when Myanmar was ready to accept them.
"The Rohingyas are not refugees. They have not come here after following proper procedures. No Rohingya has applied for asylum. They are illegal immigrants," he said.
Rohingyas are minority Muslims in western Myanmar and have been fleeing their homes following an army crackdown on their villages that has left hundreds dead.
Hundreds of thousands of Rohingya Muslims, described by the UN as the most persecuted minority in the world, fled their homes in Rakhine state recently to escape a military crackdown. It seemed a "textbook example of ethnic cleansing", UN human rights chief Zeid Ra'ad Al Hussein has said.
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Human rights group Amnesty International has blamed Myanmar's State Counsellor Aung San Suu Kyi and the country's government for "burying their heads in the sand over the horrors unfolding in Rakhine State".
The NHRC recently issued a notice to the Centre over its plan to deport Rohingyas, who are residing in various parts of India.
According to the Commission, from the human rights angle its "intervention is appropriate" in the matter.