Sonia Gandhi’s memoir reveals Pranab Mukherjee’s shock candid remark about becoming PM, amid Congress-era power dynamics and ambitious politics. Sonia Gandhi's memoir reveals Pranab Mukherjee's desire for the PM post, sparking a political debate. His daughter, Sharmistha Mukherjee, defends her father's ambition, questioning Sonia. 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".