Singh later disowned it, saying retweets are not endorsements, but the trolls did not spare him on the social media.
"Retweets are never endorsements. This is the basic principle of Twitter," he said after the controversy erupted.
"I have said it is not mine. I have disowned it. I have not used those words," he clarified, adding that "my tweet does not endorse this."
Asked whether he endorsed what he retweeted, he said, the same had been sent to him by someone and he only retweeted it.
"I have said that this is not mine. But, could not help it."
"Not mine but couldn't help posting it. My apologies to the person concerned. He is the best in the "Art of Fooling!"," he said while posting a picture of Modi with the offensive tweet.
BJP spokesman G V L Narasimha Rao lashed out at Singh, saying opposition leaders like him have "degenerated into abusive trolls" after repeated electoral drubbings.
"The Congress will have to publicly apologise for the filthy abuse of its front-ranking leaders who in the wake of repeated electoral drubbings have degenerated into abusive trolls on the social media," he said.
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