President Donald Trump frequently uses his luxury properties for government business and leisure, prompting ethics concerns.
The president said the two nations were speaking directly ahead of planned talks in late May or early June.
Kim's first trip abroad as North Korea's leader may have been aimed at shoring up his relationship with a key ally.
It is believed to be the dictator's first foreign trip since he took power in 2011.
A North Korean train unexpectedly pulled into Beijing, China, on Monday. If it is the North Korean leader, it would be his first trip outside North Korea since becoming leader seven years ago. NBC's Bill Neely reports.
President Donald Trump has agreed to meet with North Korean dictator Kim Jong Un by May to achieve denuclearization, South Korean National Security Advisor Chung Eui-Yong said Thursday.
President Donald Trump said Saturday that he would be willing to talk by phone with North Korea's leader Kim Jong Un, but said "we have a very firm stance."
President Donald Trump responded to North Korea calling him old by Tweeting that he would never call dictator Kim Jong Un "short and fat."
Tension has been high for weeks, driven by concern North Korea might conduct its sixth nuclear test or launch another ballistic missile test.
"If it would be appropriate for me to meet with him, I would absolutely, I would be honored to do it," the president told Bloomberg News. No sitting U.S. president has met a North Korean dictator.
Malaysia put the body of the estranged half-brother of North Korean leader Kim Jong Un on a plane to Pyongyang on Thursday.
Kim Jong Un is the third member of his family to rule the unpredictable and reclusive communist state of North Korea.
"It was the North Korean National Security Agency as well as its Foreign Ministry who were behind the terrorism," according to a South Korean lawmaker.
The remarks were the first by North Korea's outspoken state-controlled news agency, KCNA, since the death of Kim Jong Nam in Kuala Lumpur.
North Korea's U.K. ambassador dismissed the U.S. presidential hopeful's offer as the "dramatics of a popular actor."
A massive march through Pyongyang marked the end of the ruling party's first congress in 36 years.
Flowers were laid before the bronze statue of Kim Jong Il on Pyongyang's Mansu Hill to mark the fourth anniversary of his death.
North Korea's leader Kim Jong Un appears to have claimed his country developed a hydrogen bomb, a significant step up from an atomic one.
President Obama delivered a speech to a cheering crowd in Kotzebue, Alaska, on healthcare and the environment.
North Korea's KRT aired a new documentary showing leader Kim Jong Un at the controls of an aircraft. KRT did not specify flight's date nor location.
People in Pyongyang place flowers in front of a statue of Kim Jong Il to commemorate the leader's death 3 years ago.