NEW DELHI: Former foreign minister Natwar Singh in an interview to news channel Headlines Today said Rahul Gandhi was the reason why Congress president Sonia Gandhi did not become Prime Minister in 2004. Natwar Singh said Sonia's son Rahul Gandhi feared she would be killed like his father Rajiv Gandhi and insisted she turn down the post.Rahul Gandhi gave his mother 24 hours to turn down the post, Natwar claimed. He cited Suman Dubey, Manmohan Singh and Priyanka Gandhi as witnesses to this meeting. "I give full marks to Rahul as a son" Natwar said.The former Cabinet minister also told Karan Thapar during the interview that Priyanka Gandhi Vadra had come to meet him in May this year and had urged him to keep this story out of his book which will be launched next month.Natwar Singh's forthcoming autobiography is expected to embarrass the Congress leadership because he has been an insider in the party for three generations of the Gandhi family.When asked by Karan Thapar if these details should be kept private, Natwar said, "Sonia Gandhi is a historic figure. Historic figures don't have privacy."He mentioned other party leaders Lalu Yadav and Ramvilas Paswan wanted Sonia and not Manmohan Singh as Prime Minister.Sonia GandhiIn other highlights, Natwar Singh said former President Shankar Dayal Sharma was Sonia's Gandhi's first choice to become Prime Minister when the Congress came to power in 1991. Narasimha Rao was the second choice after Sharma refused due to poor health.Natwar Singh