Trump and Kim are expected to meet in May.
Kim's offer to meet with Mr Trump, which a South Korean envoy conveyed last month, has not been publicly confirmed by the regimen.
USA and North Korean officials have held secret contacts recently in which Pyongyang directly confirmed its willingness to hold the unprecedented summit, the official told Reuters, speaking on condition of anonymity.
Read alsoChina says North Korea pledges denuclearization during friendly visit - mediaCentral 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.
North Korea is hoping to hold the planned summit between its leader Kim Jong Un and U.S. President Donald Trump in Pyongyang, CNN reported Saturday, citing several U.S. administration officials. 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, CNN reported.
Trump informed about the preparations to the meeting with the leader of the North Korea on March 9. Officials said the current target is late May or even June.
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In a separate report, a USA think-tank says North Korea may have started testing a new reactor.
The North has said it is willing to hold "candid" talks with the United States to bring about denuclearisation of the peninsula and normalise ties, although Mr Trump has called for more concrete steps toward denuclearisation before the meeting takes place.
China and Russian Federation are both permanent members of the United Nations Security Council, which has imposed sanctions on North Korea in a bid to force negotiations with Pyongyang.
CNN quoted USA officials as saying that the summit will be held in the Mongolian capital Ulaanbaatar.
The spokesperson would not say who had met with North Korea officials, describing the details as internal United States preparations, but added that "a comprehensive, whole-of-government effort in support of the president is actively under way".