US President Donald Trump is reportedly "furious" at the "underwhelming" turnout at his Saturday night rally in Tulsa, Oklahoma, multiple sources told NBC News.

A Tulsa fire marshal noted that only 6,200 people turned up in the 19,000-seat BOK Center.

Trump administration officials have blamed a number of factors on the poor turnout, including fears of coronavirus, BLM protesters outside, and social media users making fake bookings.