Prime Minister Narendra Modi on Thursday became the fourth-longest serving Prime Minister of India surpassing Atal Bihari Vajpayee's tenure. He is now also the longest-serving non-Congress Prime Minister. "PM Modi is now the longest serving Indian PM of non-Congress origin. Vajpayee ji served for 2,268 days in all his terms combined. On Thursday, PM Modi surpassed this tenure," the BJP said. Jawaharlal Nehru, Indira Gandhi and Manmohan Singh - all from the Congress - are the three longest serving Prime Ministers in that order.