"I believe that the BJP led NDA government can give a new and fair deal to India," he said after joining the party.
Singh, who had a fall out with Bihar Chief Minister Nitish Kumar after denial of a Rajya Sabha renomination to him, said only the BJP can provide a strong and stable government with credible leadership in the present political scenario.
A former IAS officer of 1964 Bihar cadre, Singh had worked in the prime minister office of Atal Bihari Vajpayee's regime and was also then member of Planning Commission.
"India faces serious economic and political challenges as a consequence of the lost decade that we are struggling to overcome. We need a strong and stable government to rejuvenate our sagging morale. Only the BJP can provide the purposive and resolute policies, programmes and leadership in the current scenario.
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"I believe that only an NDA government led by the BJP can usher a new India reviving the engines of growth and progress and replace the prevailing atmosphere of gloom with optimism and hope," he said.
Singh, who was inducted in BJP at party president Rajnath Singh's residence, said he has joined the saffron party "unconditionally" and said he has offered himself for any task given to him by the party leadership.
He tendered his resignation from the JD(U) yesterday and wrote a letter to Nitish Kumar, pointing out the infirmities in the decision making process in the party.