US President Donald Trump has said that there was a “substantial chance” his summit with North Korean leader Kim Jong-Un will not take place as planned on June 12 amid concerns that Kim is resistant to giving up his nuclear weapons.

Trump raised doubts about the Singapore summit in talks with South Korean President Moon Jae-In, who came to Washington to urge Trump not to let a rare opportunity with reclusive North Korea slip away.

If the summit is called off, it would be a major blow to what trump supporters hope will be the biggest diplomatic achievement of his presidency, and a huge disappointment for the President himself.

The North has said it may cancel the summit if the US insists on it giving up nuclear weapons unilaterally.North Korea is expected to dismantle a nuclear test site this week as a good will gesture but the demolition may be delayed by bad weather.

He also said Kim Jong-Un’s attitude had changed after his second visit to China, earlier this month.Later in the day, during a news conference, Secretary of State Mike Pompeo adopted a more positive position, saying the US was still working towards the 12 June date for the summit.He commended China for offering “historic assistance” in putting pressure on North Korea.