WASHINGTON (REUTERS) - US President Donald Trump is willing to walk away from an unprecedented summit with North Korean leader Kim Jong Un scheduled for next month, US Vice-President Mike Pence said on Monday (May 21), after North Korea called into question the meeting last week.

Mr Pence told Fox News that North Korea should not attempt to seek concessions from the United States for promises it did not intend to keep.

"It would be a great mistake for Kim Jong Un to think he could play Donald Trump," Mr Pence said according to excerpts of an interview made available by Fox.

When asked if Mr Trump could still walk away from the summit scheduled for June 12 in Singapore, he replied: "Well there's no question."