At a time when unease and uncertainty have crept into India-America relations, U.S. Secretary of State, Marco Rubio arrived in New Delhi on a mission that was as much about reassurance as diplomacy. The visit has been officially projected as part of Washington’s continuing commitment to the Indo-Pacific and the Quad framework, but the deeper purpose was unmistakable: repairing strategic trust that has weakened in recent months under President, Donald Trump’s second administration. Challenges Before Both NationsDespite the warmth displayed during Rubio’s visit, several structural challenges continue to complicate India-U.S. ties.The first is trade. Protectionist tendencies in Trump’s economic policy…