Central Intelligence Agency Director Mike Pompeo and a team at the CIA have been working through intelligence back-channels to make preparations for the summit, the officials said. American and North Korean intelligence officials have spoken several times and have even met in a third country, with a focus on nailing down a location for the talks.

Although the North Korean regime has not publicly declared its invitation by Kim Jong Un to meet with Trump, which was conveyed last month by a South Korean envoy, several officials say North Korea has since acknowledged Trump's acceptance, and Pyongyang has reaffirmed Kim is willing to discuss the denuclearization of the Korean peninsula.