Obama's invitation to Dr Singh was delivered by US Deputy Secretary of State William Burns during his recent visit to New Delhi, sources said.
Dr Singh has accepted the invitation and will be traveling to Washington, the sources said.
The PM's visit to Washington could be clubbed with his tour to New York when he travels there to attend the United Nations General Assembly, they said. This will be Dr Singh's second bilateral visit to the US during Obama's tenure.
Image: Prime Minister Manmohan Singh with US President Barack Obama