Your typical Trump rally this was not.

First there was the ritual Hindu fire, a yagna, which burned in his honor. Then there were the posters, standard Donald J. Trump head shots except for a touch of artistic interpretation: a tilak, the red dot symbolic of the spiritual third eye in Hindu culture, smudged on his forehead.

This celebration of Mr. Trump in New Delhi in May, and others like it in India this year, are the work of a small, devoted and increasingly visible faction of Hindu nationalists in India and the United States who see Mr. Trump as the embodiment of the cocksure, politically incorrect, strongman brand of politics they admire.

That some of Mr. Trump’s most passionate followers are Indian may seem, at first, somewhat strange, given how fond he is of scorning Asian countries where cheap labor saps demand for American workers. A poll on Asian-Americans’ political leanings conducted in August and September found that just 7 percent of Indian-Americans said they would vote for Mr. Trump.

But in one of the more peculiar pairings of this most peculiar political season, Mr. Trump has unwittingly fashioned a niche constituency in the overlap between the Indian right and the American right, which share a lot of the same anxieties about terrorism, immigration and the loss of prestige that they believe their leaders have been too slow to reverse.