Following discussions with Democratic Senator Hillary Clinton in New York, Singh said the former first lady had assured him that Democrats would not hinder the passage of the deal through the US Congress.
"With Republicans already on board, there is no reason that the 123 agreement with India would not go through this month," he told PTI.
Singh also said that American firms would not be put on disadvantage when India orders equipment following the operationalisation of the agreement.
Accusing dissenting parties in India of placing politics ahead of the country's interest, Singh said the deal would enable the country to achieve energy security.
"Former President A P J Abdul Kalam was among the renowned scientists who had supported the deal and they simply could not have done it if it was not in the interest of the country," he pointed out.
Samajwadi Party's support to the Congress-led government played a crucial role in enabling the Indian administration to approach the International Atomic Energy Agency for its approval to the India-specific safeguards agreement.
Chairman of the Indian American for Democrats group, Sant Chatwal, also said he had positive feelings for the deal during his meetings with several ranking Democratic lawmakers.
"We are working day and night to ensure that the deal goes through before the Congress adjourns on September 26 as it is in the interest of both countries," he added.
Image: Amar Singh with Hillary Clinton and Sant Chatwal in New York.
Photograph: Snapsindia