"BJP-led NDA will form the next government at the Centre and then inquiry would be conducted into scams of the UPA government. Whosoever is guilty, would get punished," Singh told reporters here.
Attacking the Congress, Singh said the interim budget presented by Union Finance Minister P Chidambaram would be the last one of the UPA government.
Taking offence on being termed as a leader of backward class, he said that he was the leader of all sections of the society.
Terming him corrupt, Singh alleged that Kejriwal had collected donation for his trust while on leave from government job.
He said that Kejriwal had sworn not to take support in forming the government, but later formed the same with the support of Congress.
Singh also noted that Delhi had not got the stauts of a full state, and in several issues, it did not have the power to frame a new law without the consent of the Lieutenant Governor.