US President Donald Trump has turned down India's invitation to be the chief guest at next year's Republic Day parade.

"President Trump was honoured by Prime Minister Modi's invitation for him to be Chief Guest of India's Republic Day on January 26, 2019 but is unable to participate due to scheduling constraints," a White House spokesperson said.

Every year, India invites world leaders to attend its Republic Day and Independence day celebrations.

Modi and Trump are scheduled to attend the G-20 Summit in Argentina on November 30 and December 1. It is possible that the two leaders might meet and discuss bilateral relationship there.