"To accomplish this, India remains a key piece in the jigsaw for the US. President (Donald) Trump will need to assure India that it is not merely a regional prop to balance Beijing's power in the region, but a top priority for US foreign policy under the Trump administration," said the policy paper authored jointly by the former Union Minister Manish Tewari and Bharat Gopalaswamy, director of the South Asia Center of the Atlantic Council.