Trump said they are currently on their way to the US.

Trump said they have been  released to US Secretary of State Mike Pompeo during his visit to Pyongyang.

"I am pleased to inform you that Secretary of State Mike Pompeo is in the air and on his way back from North Korea with the 3 wonderful gentlemen that everyone is looking so forward to meeting. They seem to be in good health. Also, good meeting with Kim Jong Un. Date & Place set," Trump tweeted.

Trump said he will be present in the airport to greet Pompeo and the Americans.

"Secretary Pompeo and his 'guests' will be landing at Andrews Air Force Base at 2:00 A.M. in the morning. I will be there to greet them. Very exciting!," he said.

The meeting is taking place just days before the expected meeting between Trump and Kim.

Kim and Chinese President Xi Jinping met in northeast China on Tuesday.

"Xi Jinping, general secretary of the Central Committee of the Communist Party of China (CPC) and Chinese president, met Kim Jong Un, chairman of the Workers' Party of Korea (WPK) and chairman of the State Affairs Commission of the Democratic People's Republic of Korea (DPRK), in Dalian, northeast China's Liaoning Province, on May 7-8," reported China's news agency Xinhua.