"When Rajiv Gandhi was leading the party, Congress got more than 400 seats in Lok Sabha polls. When Rahul Gandhi was given the leadership, the party's tally came down to 44 from 206.
"When we compare the leadership of Rahul Gandhi and Rajiv Gandhi, then there is a vast difference between the two. We should remember Congress came to power in a number of states when Rajivji led the party. When Rahul took over Congress lost state after state," Singh told PTI.
Reacting sharply to it, Congress suggested that Singh is being "ungrateful" after "getting so much from Congress" in last three decades.
"It was the same Rahul Gandhi, who made him the Finance Minister in Haryana government in 2005. Then he was made AICC General Secretary. And after he lost in Lok Sabha polls, he was made a Rajya Sabha MP. But he suddenly joined the BJP. He started liking Modiji due to his vested interests.
"Congress has given him so much and then suddenly he tilted to the BJP. That is unfortunate," party spokesman Vijay Inder Singla told reporters reacting to Singh's remarks.