DONALD Trump fans in India have celebrated the US presidential hopeful's birthday with a party in a New Delhi park.

About 20 members of the right-wing Hindu Sena political group cut a three-tiered cake and held a piece up to a photograph of Trump, while singing Happy Birthday.

The group invited journalists to the gathering under a tent decorated with balloons and posters of the presumptive Republican presidential nominee, including one showing him holding a rifle.

Sena leader Vishnu Gupta said they were inspired by Trump's tough stance on Islamic militants.

This is the second event the group has staged for Trump. Last month, a dozen members lit a ritual fire and asked Hindu gods to help him win the election.