Top US Pollster Frank Luntz has revealed there may be "surprises" for Donald Trump, as he prepares to run for his second term as US President.

Speaking to Nigel Farage in Iowa, Luntz predicted the outcome of the election, set to take place on November 5.

Luntz told GB News viewers: "A surprise is going to happen. I think he wins this caucus. I think he wins it going away. The question for me is does he get 50%."