‘One-time shot’ for peace with North Korea: Trump

US President Donald Trump predicted on Sunday that he would know within a minute of meeting Kim Jong Un whether his "one-time shot" at peace with the North Korean leader had a chance of succeeding.

Speaking just before embarking on his marathon journey to Singapore for the pair's historic summit, Trump bristled with confidence as he boasted that contacts between their respective negotiating teams had been positive.

"It's unknown territory in the truest sense but I really feel confident," Trump said as he prepared to leave the ongoing G7 summit in Canada early and head to Asia, reports AFP.

"I feel that Kim Jong Un wants to do something great for his people and he has that opportunity... It's a one-time shot," he said adding that the North Koreans had been working "very well with us."

"I am on a mission of peace and we're going to be carrying the hearts of millions of people from all over the world," he said. "We have to get denuclearization, we have to get something going." Asked how long it would take for him to

work out if Kim was serious about striking some kind of peace deal, Trump replied: "I think within the first minute I'll know. "It's just my touch, my feel. That's what I do."I think I'll know pretty quickly whether or not, in my opinion, something positive will happen. And if I think it won't happen, I'm not going to waste my time. I don't want to waste his time." - 'Positive spirit' After North Korea carried out a series of long-range missile

tests that potentially put the US mainland in range of a nuclear strike, Trump promised to respond with "fire and fury".

He also ridiculed Kim in a speech at the UN General Assembly as "Little Rocket Man" who in turn called Trump a "dotard".

But after a cooling of the rhetoric, both sides began forging tentative contacts that eventually saw Mike Pompeo -- the former head of the CIA who is now secretary of state

-- meet Kim in Pyongyang. "Our people have been working very, very well with the representatives of North Korea. We're going in with a very positive attitude and I think we're going to come out fine," he added.

"But I've said it many times, who knows? Who knows? may not. May not work out. There's a good chance it won't work out. There's probably an even better chance that it will take a period of time. It will be a process."