When asked at a press briefing whether Trump and Kim shared the same definition of denuclearization, State Department Spokeswoman Heather Nauert said: "That is something that the president has determined".
Trump and Kim are set to meet at 9 a.m. Tuesday in Singapore, which is 9 p.m. Monday on the U.S. East Coast.
Pyongyang has said it is willing to deal away its entire nuclear arsenal if the United States provides it with reliable security assurances and other benefits.
Rodman is one of a handful of Westerners to have visited reclusive North Korea and met Kim.
While hopes for a possible peace treaty among the Koreas and the US have been rising, Moon and his government's role of mediator is unlikely to end with a successful US-North Korea summit.
According to accounts of the G-7 meeting, officials from other members of the bloc confronted Trump with a torrent of statistics about the importance of the US -authored global order and the merits of free trade. "It's never going to be there again", Trump said on Saturday. [US] Amb [assador to the Philippines Sung] Kim meets with #DPRK [delegation] today.
Would you rather have net neutrality or an open internet?
But unlike with the issues of blocking or slowing access to internet services, they've been much less definitive on fast lanes. How could the net neutrality repeal affect you? The slowdown was only fixed after Netflix agreed to pay for the upgrades.
He accepted the invitation from President Halimah Yacob to make a state visit to Singapore in November, in conjunction with the 6th Asean-US Summit and 13th East Asia Summit. Those include terminating America's military presence in South Korea as well as ending the US regional nuclear umbrella, a security arrangement in which Washington promises in-kind retaliation on behalf of close allies if they are attacked with nuclear weapons.
According to the information, the President of the DPRK landed shortly after noon in the middle of a strong security device adopted in view of his meeting with Trump on Tuesday. He initially touted the potential for a grand bargain with North Korea to rid itself of a nuclear missile programme that has advanced rapidly to threaten the United States.
The top Democrat on the Senate Foreign Relations Committee says the North Korean leader has already achieved some success just by bringing the American president to the table. And since Kim assumed power in 2011 the trade relationship has become even more important.
Though it could mean many things, the relative speed of the reports about Singapore could be seen as a sign of confidence by the North that the summit will go well.
Aboard Air Force One en route to Singapore, Trump tweeted, "I look forward to meeting [Kim] and have a feeling that this one-time opportunity will not be wasted!"
Two additional North Korean planes were also tracked making their way from Pyongyang, thought to be carrying his entourage, food and other supplies for Kim.
Experts believe the North is close to being able to target the entire US mainland with its nuclear-armed missiles, and while there's deep skepticism that Kim will quickly give up those hard-won nukes, there's also some hope that diplomacy can replace the animosity between the USA and the North. He has also raised the possibility of further summits.