"Today the definition of secularism is being challenged. What does secularism mean to us. It means 'sarva dharma sambhav' (equality of all religions). And now, Prime Minister Modi is trying to occupy the centrestage of the Congress party. Can a leopard ever change its spots. It cannot," Singh claimed.
"Mr Modi is now talking of tolerance. He is talking of the right of minorities," he said, at an event to observe the 125th birth anniversary of Pandit Jawaharlal Nehru here.
"I would like to ask him. Is he repenting that thousands of innocent people were killed in Gujarat riots? Is he prepared to give justice to those who suffered in 2002 riots? These are the issues Modi should first address," he said.
Singh also asked Modi whether he is ready to take action against a BJP leader accused in the Muzaffarnagar riots or drop a Union minister for her "Ramzada and ... Remarks", which divided the nation.
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Singh asked Modi to first act instead of talking on the issue of protecting the interests of minorities. "If he is serious about keeping the country together, and if he is serious about looking into the interest of minorities, he first must act. Only words will not make a difference."
He alleged that officers, who investigated false police encounters are being "harassed" and activists like Teesta Setalvad who fought for secularism are being "hounded".