Former Congress chief Sonia Gandhi has recalled how Pranab Mukherjee hinted at his ambition to become prime minister during a 2010 conversation, leaving her "shocked". Her account in her memoir. The late Pranab Mukherjee, former President and a Congress veteran, suggested a “change at the top” during a chat with then-UPA spokesperson Sonia. A Journey of Love' has hit the bookstores across the country.