United States presidents rarely join other countries' leaders before diaspora events, and Mr Trump - with a hard line on immigration one of his signature issues - is hardly known for celebrating ethnic diversity.
Organisers of Sunday's "Howdy Modi" event in Houston, as also those planning to protest the Indian prime minister's visit, heaved a sigh of relief as tropical storm Imelda weakened in the city on Saturday morning and flood waters receded.
India, the world's third largest oil importer, has been concerned over the Saudi oilfield attacks and also after New Delhi stopped its oil imports from Iran following ending of the US' conditional waiver. "Indo-American Chamber of Commerce of Greater Houston welcomes Prime Minister of India Shri Narendra Modi".
On September 25, the Prime Minister will deliver a keynote address at the plenary of the Bloomberg global business forum. Recently Foreign Secretary Vijay Gokhale said it was up to America to take a call on reinstating India's status as a beneficiary of that programme while asserting India meets the criteria for trade concessions under the GSP. According to industry sources, an energy major of India Inc may finalise a deal to pick up equity stake in a US-based Fortune 500 oil company. Trump tweeted on Sunday.
Responding to a question, he said Sikhs and other religious minorities in India are safe. "And we understand that", he added.
US President Donald Trump on Sunday said that ties between India and the US has never been better and added, Modi's pro-growth policies have lifted almost 300 million out of poverty.
Over 150,000 residents in Houston are Indian American, with more than half born in India.
More than a 1,000 Gujaratis from Houston are preparing for a mega "dandiya", a traditional Gujarati dance, to welcome the Prime Minister for the event.
The spokesperson said the audience will hear PM Modi speak about the deepening US-India ties strengthened by the contributions of over three million Indian-Americans in the US. "We have one and only one agenda: to expose the undemocratic, anti-people and anti-minorities agenda of Mr. Modi's government and BJP party".
Asserting that the United States administration's position and Trump's position has been very clear, he said, "Actually, the U.S. administration's position and President Trump's position is very clear and his position has been very clear from day 1".