Just weeks ago, Gautam Adani, one of the world’s richest men, celebrated Donald Trump’s election victory and announced plans to invest $10bn (£7.9bn) in energy and infrastructure projects in the US.

Now, the 62-year-old Indian billionaire and a close ally of Prime Minister Narendra Modi, whose sprawling $169bn empire spans ports and renewable energy, faces US fraud charges that could potentially jeopardise his ambitions at home and abroad.