Singh, who has been under opposition attack after the filing of an FIR by the CBI against industrialist Kumar Mangalam Birla and former Coal Secretary P C Parakh in a coal block allocation case, broke his personal silence for the first time since the controversy broke out 10 days ago.
"I am not above the law of the land. If there is anything the CBI or, for that matter anybody, wants to ask me, I have nothing to hide," he told reporters on board his special plane on the way back from China after a two-nation visit.
Noted industrialists and trade bodies had attacked the CBI action, saying caution should be exercised while dealing with reputed individuals, industrialists and honest bureaucrats.
Initially, Singh appeared to be reticent in answering a question on whether CBI should be given so much autonomy that an inspector of the agency would be allowed to question the prime minister.
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He was asked for his comments about the Supreme Court monitoring the probe in various scams affecting the decision-making process and adding to the government's image of being struck by "policy paralysis".
"I would not like to go into what is happening in the Supreme Court. It is the highest court of the country and I would not like to comment about the court as to what it does or does not," he responded.
To a question whether CBI cases and scams were casting a shadow on his legacy as Prime Miniser, Singh shot back, "That is for history to judge. I am doing my duty and will continue to do my duty. What impact my 10 years of prime ministership will have, it is for historians to judge.