President Donald Trump is preparing to hold a second summit with Kim Jong Un, following a request from the North Korean dictator for another encounter in the wake of their historic June meeting in Singapore.

The White House said it had started planning for a second summit between the leaders after Mr Trump received a “very warm, positive letter” from Mr Kim. The move comes despite North Korea having shown no signs of following through on the denuclearisation pledge that Mr Kim made to Mr Trump in June.

“The primary purpose of the letter was to request and look to schedule another meeting with the president, which we are open to and are already in the process of co-ordinating,” Sarah Sanders, White House press secretary, told reporters on Monday.