Evian [France], June 17 : US President Donald Trump on Wednesday characterised New Delhi as an essential partner in navigating regional challenges, noting that India is a "trusted ally" and is playing a "big role" in efforts to address the crisis in West Asia.  Trump said this after having high-level discussions with Prime Minister Narendra Modi on the margins of the G7 Summit here, addressing maritime security, economic cooperation, and the evolving geopolitical landscape in the Gulf region.  When asked if he expects India to play any role in West Asia, Trump said, "Yes, I do.