US elections: With Indian-origin leader Nikki Haley’s departure from the US presidential race, former President Donald Trump now remains the sole Republican contender on his way to secure his third consecutive presidential nomination for the November elections, effectively setting up a historic rematch with his Democratic rival Joe Biden.US elections: With Indian-origin leader Nikki Haley’s departure from the US presidential race, former President Donald Trump now remains the sole Republican contender on his way to secure his third consecutive presidential nomination for the November elections, effectively setting up a historic rematch with his Democratic rival Joe Biden.