President Donald Trump is expected to headline his largest rally yet on Sunday when he appears in Houston in an effort to appeal to a growing political force in the United States: Indian Americans. Trump will speak to an expected crowd of 50,000, mostly Indian Americans, who are flocking to the most diverse city in the nation to catch a glimpse of Indian Prime Minister Narendra Modi at what is being touted as the largest event in the U.S. for a leader of foreign country.