(U.S. President Donald Trump speaks during the daily briefing of the coronavirus task force in the Rose Garden at the White House on April 27, 2020 in Washington, DC.)[Getty/Kyodo]  

WASHINGTON - U.S. President Donald Trump said Monday that he has information about the health condition of North Korea's Kim Jong Un, as rumors continue to swirl that the leader of the secretive country may be gravely ill.

"I do have a very good idea (about Kim's health condition), but I can't talk about it now," Trump told a press conference at the White House.

"You'll probably be hearing in the not too distant future," he said, while adding that he has a "very good relationship" with Kim and hopes "he's fine."

Rumors over the North Korean leader's health have continued to circulate since he missed the celebration of the birth of his late grandfather and the nation's founder, Kim Il Sung, on April 15 -- one of the most important holidays in the country.

Last week, CNN reported the United States is monitoring intelligence that Kim was in grave danger after surgery, citing a U.S. official with direct knowledge. But Trump said later that he thinks "the report was incorrect."

Reuters, meanwhile, said Saturday that China has sent a team including medical experts to North Korea. The news agency said it was unable to determine what the dispatch of the team indicated about the status of Kim's health.

A U.S.-based website that monitors North Korea said over the weekend that a train probably belonging to him was spotted in a resort town on the country's east coast in recent days.

38 North said satellite imagery showed that the train has been parked at a station servicing Kim's compound in Wonsan since at least April 21.

Kim's movements have not been reported in North Korean official media since April 12, fueling talks among experts of foreign affairs on who would take over should anything happen to him and the fate of the nuclear-armed nation.

Trump held three summits with Kim in 2018 and 2019 in an effort to rid North Korea of its nuclear weapons.

In another development, Reuters reported on Tuesday that a North Korean economic delegation is due to arrive in Beijing this week to discuss food supplies and trade issues, citing two people with direct knowledge of the situation.

North Korea has cut off traffic to and from China and Russia since earlier this year in the wake of the spread of the new pneumonia-causing coronavirus, which is believed to have dealt a severe blow to the country's economy.

Beijing is known as Pyongyang's closest and most influential ally in economic terms. North Korea depends on China for more than 90 percent of its trade.

Reuters said the delegation's possible visit to Beijing is unrelated to Kim's health status.