New Delhi: Congress President Sonia Gandhi has written to Prime Minister Manmohan Singh over the suspension of IAS officer Durga Shakti Nagpal, saying the officer must not be "unfairly treated".PromotedListen to the latest songs, only on JioSaavn.comHere is the full letter:Also Read"Congress Minorities' Biggest Enemy": PM Says Reservation Key Issue Of 2024Burden On Sonia Gandhi: Himanta Sarma Slams Rahul Gandhi's Agniveer RemarkSlovak PM Robert Fico's "Condition Improving" Weeks After Assassination Attempt