Haenle served as the White House representative at negotiations with North Korea under U.S. President George W. Bush, and as a national security advisor in the Obama administration.
Mr Kim has also said he wants to focus on building the North Korean economy - and thus wants sanctions relief and global investment. "And he has that opportunity, and he won't have that opportunity again", Trump said. Trump descended from Air Force One into the steamy Singapore night, greeting officials and declaring he felt "very good" before being whisked away to his hotel via a route lined with police and photo-snapping onlookers.
You would never know something as historic as the Trump-Kim summit was about to happen in the city state of Singapore.
At the hotel lobby, grim-faced North Korean security guards warned other hotel guests not to take pictures as Kim walked to his Mercedes Benz limousine.
Late on Monday. Trump phoned Moon from Singapore.
"North Korea can not denuclearise completely right now and hope to be safe from a president who said we're going to rain fire and fury on you, from a country that's been calling you evil for 25 years", said Horacio Falcao, a negotiations expert at the INSEAD graduate business school in Singapore. The North has faced crippling diplomatic and economic sanctions as it has advanced development of its nuclear and ballistic missile programs.
Mr Trump's first year in office was marked by bitter exchanges between himself and Mr Kim - as North Korea conducted several ballistic missile tests in defiance of the worldwide community.
Asked about a North Korean state media report that Trump and Kim were set to talk denuclearization and peace on the Korean peninsula, the official said the report is a hopeful indication.More news: Meghan Markle: Duchess of Sussex nervous in first Buckingham Palace balcony appearance
More news: Kevin Love Wants to Finish His Career With LeBron James on Cavs
More news: LeBron James praises Kevin Durant while throwing shade at the Trail Blazers
Bringing the Korean War to a formal end 65 years after hostilities ceased will also be on the table at the first-ever summit between a North Korean leader and a sitting USA president of its "imperialist enemy".
Trump had been scheduled to fly back to Washington on Wednesday morning after spending Tuesday with the North Korean leader in Singapore.
But in his new diplomatic role - until March he had not left his country for more than six years - Kim has come across as polite, respectful and even charming in meetings with the Chinese and South Korean leaders.
Trump has returned to his hotel after meeting with Singapore's Prime Minister Lee. "This aligned him with North Korean leader Kim Jong Un's position on a feasible timeline for denuclearization", Patrick McEachern, a former foreign service officer in South Korea and a North Korea analyst, told Newsweek.
Besides, Singapore's prime minister "wished Chairman Kim success for the US-DPRK Summit and expressed hope that the US-DPRK meeting will advance the prospects for peace and stability on the Korean Peninsula and the larger region".
As anticipation for his historic summit with North Korea has ratcheted up, salesman in chief Donald Trump has done something out of character: ratcheted expectations down.
It's not just the logistics of Kim's trip that are unclear.
Pompeo said these guarantees would be "different and unique" from what the U.S. has been willing to provide before.
A bad deal with North Korea, one that hastens or brings about the withdrawal of U.S. troops from South Korea, would likely accelerate the loss of United States influence in the world's most populous region, and thereby the decline of the USA as the world's superpower.