On October 19, US Attorney for the Southern District of New York Preet Bharara submitted to the court a suggestion of immunity for Modi for his alleged role in the 2002 communal riots in Gujarat when he was the state's chief minister.
The petition was filed by two unnamed victims of the post-Godhra riots and American Justice Center (AJC), a New York based nonprofit human rights organisation.
The letter was written by Mary McLeod, a State Department Legal Adviser to Joyce R Branda, the Acting Assistant Attorney General, on September 30, the day Modi was meeting with President Barack Obama at White House.
"This letter recognises the particular importance attached by the United States to obtaining the prompt dismissal of the proceedings against Prime Minister Modi in view of the significant foreign policy implications of such an action," the State Department said.
"The human rights violations committed by Modi before becoming Prime Minister and as Chief Minister of Gujarat are not immune.
US Federal Court has jurisdiction to hold Modi accountable under the Alien Tort Claims Act and Torture Victims Protection Act," argued Gurpatwant Singh Pannun, legal advisor to the AJC.