On the 2002 riots, he said the Gujarat chief minister had made no mistake and there was no case for an apology.
"Majority of riots took place during Congress rule. Have they (Congress) apologised?" Singh shot back when enquired about demands that Modi should apologise for the riots.
Asked whether the Congress should apologise first and then Modi will, he said, "I am not saying that. Had there been any mistake on part of Modi, had he made no effort to control the riots, then there could be apology."
"But, being the chief minister, he made the maximum effort, tried his best, to control the riots. He never tried to scuttle any probe. Then why are there still demands for apology? This is vindictive politics by Congress."
Describing Modi as the "most harassed" politician, Singh said the Congress is targeting him as it is "desperate" owing to his popularity.
Singh, who gave the interview in the midst of hectic campaigning which involved around three to four rallies per day on an average, was also questioned if Modi would have better acceptability had the 2002 riots not taken place.
