This has left questions mounting over the country's actual intent to participate.
"We'll be meeting with them sometime in May, or early June", Mr. Trump said at the start of a cabinet meeting.
The official, speaking on condition of anonymity, said USA and North Korean officials have held secret contacts recently in which Pyongyang directly confirmed its willingness to hold the unprecedented summit.
At the very least, Kim would agree to relinquish his weapons only if the United States agreed to end its military alliance with South Korea, in place since the 1950-53 Korean War, Narang said.
Kim chaired a meeting of the Political Bureau of the Central Committee (C.C.) of the Workers' Party of Korea (WPK) "upon the authorization" of the organ, state media said, providing a report on the "development of the recent situation on the Korean peninsula".
However, Pyongyang has never officially confirmed its offer of denuclearisation talks to the White House, which was delivered by a South Korean envoy.
Soon after the announcement was made, Trump remarked on the historic meeting on Twitter.
But Pyongyang has been silent publicly since then about a summit, even as Kim visited Beijing last month in his first visit outside North Korea since assuming control of the country after his father, Kim Jong Il, died in 2011.
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'I think there will be great respect paid by both parties and hopefully there will be a deal on denuking, ' Trump said.
They appear, however, to be much more low-key this year.
The official accompanied the North's Foreign Minister Ri Yong-ho at a ministerial-level meeting of the Non-Aligned Movement (NAM) in Baku, Azerbaijan, last week.
Trump, also, criticized his predecessors for not addressing Washington's contentions with Pyongyang.
It is scheduled to take place without the months of groundwork that usually precedes such meetings.
Mongolia's capital Ulaanbaatar is also considered as one of the possible locations, the report added.
Beyond that, a detailed agenda for the talks will need to be set. -North Korea contact is proceeding smoothly.