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FILE - Former Indian prime minister Manmohan Singh, center, gestures after a short meeting with the newly elected office bearers of "National Students' Union Of India" (NSUI), who called on him at his residence in New Delhi, India, Tuesday, March 17, 2015. (AP Photo/Tsering Topgyal, File)

FILE - Former Indian prime minister Manmohan Singh, center, gestures after a short meeting with the newly elected office bearers of "National Students' Union Of India" (NSUI), who called on him at his residence in New Delhi, India, Tuesday, March 17, 2015. (AP Photo/Tsering Topgyal, File)

FILE - Indian Prime Minster Manmohan Singh addresses a press conference, in New Delhi, India, Friday, Jan. 3, 2014. (AP Photo/Harish Tyagi, Pool, File)

FILE - Indian Prime Minster Manmohan Singh addresses a press conference, in New Delhi, India, Friday, Jan. 3, 2014. (AP Photo/Harish Tyagi, Pool, File)

FILE - Indian Prime Minister Manmohan Singh greets the crowd during an election campaign rally at Khumtai, in the northeastern Indian state of Assam, Saturday, March 29, 2014. (AP Photo/Anupam Nath, File)

FILE - Indian Prime Minister Manmohan Singh greets the crowd during an election campaign rally at Khumtai, in the northeastern Indian state of Assam, Saturday, March 29, 2014. (AP Photo/Anupam Nath, File)

FILE - Indian Prime Minister Manmohan Singh speaks during the 68th session of the General Assembly at United Nations headquarters, Saturday, Sept. 28, 2013. (AP Photo/Seth Wenig, File)

FILE - Indian Prime Minister Manmohan Singh speaks during the 68th session of the General Assembly at United Nations headquarters, Saturday, Sept. 28, 2013. (AP Photo/Seth Wenig, File)