US President Donald Trump says there is a very substantial chance a historic summit with North Korea’s Kim Jong-Un next month may not happen.

Mr Trump, who was speaking as he received South Korea’s President Moon Jae-In at the White House, said the North must meet conditions for the summit to go ahead.

Trump did not say what conditions the US had set for the summit.

The North has said it may cancel the summit if the US insists on it giving up nuclear weapons unilaterally.