New Delhi, May 17 (ANI): Prime Minister Manmohan Singh submitted his resignation to President Pranab Mukherjee in Rashtrapati Bhawan on Saturday, a day after the BJP routed the Congress in the Lok Sabha election. Earlier in the day, Dr Singh addressed the nation for the last time before submitting his resignation. Manmohan Singh was the prime minister at the head of a Congress-led government since 2004.