A priest chanted hymns and members of the Hindu Sena made offerings to fire, as they sat holding posters of the Republican presidential candidate, with "We love Trump" written in bold letters.
The president of the Hindu Sena, Vishnu Gupta, said Trump was the only "saviour of mankind".
"The entire world is suffering due to Islamic terrorism. All these bomb blasts across the world are linked to Islamic terrorism. There is only one saviour of mankind and that is Donald Trump. We have done Yagya today and prayed to god that people of the US elect Trump as their Presdent," Gupta said.
Trump has won both supporters and detractors for his blunt talk and hardline proposals, including a proposed ban on Muslims entering the United States.
The billionaire real estate developer has positioned himself as the answer to growing Islamic radicalism across the world.