By Rupam Jain NEW DELHI (Reuters) – India has requested the United States to share intelligence on Sikh separatists living there amid investigations into an accusation that an Indian official was linked to a plot to kill a Sikh separatist on American soil, an Indian official said on Tuesday. The request was made by the National Investigations Agency (NIA), India’s federal anti-terrorism agency, in meetings with visiting FBI Director Christopher Wray, said the official, who works at NIA and spoke on condition of anonymity. The issue of what New Delhi says are Sikh separatists operating against …