NEW DELHI - Seven months into his term as India’s High Commissioner to UK, Navtej Sarna is being asked to move to Washington as the country’s next ambassador, as the US prepares for a presidential transition, well-informed sources said. Sarna’s name was discussed and cleared at the highest level,sources said. He will take over from Arun Kumar Singh who retires by month-end. Both Sarna and Singh are former Indian ambassadors...