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Officials remain uncertain what will come out of Tuesday's unprecedented summit, the first of its kind between a sitting US president and the leader of North Korea.
"I feel really", Trump told reporters.
"We may be able to recoup a little bit of that, but I think it is a cost that we're willing to pay and it's our contribution to an worldwide endeavor, which is in our profound interests", he added.
"The old prejudices and practices worked as obstacles on our way forward, but we've overcome all of them, and we are here today", he said.
If Trump and Kim fail in Singapore, "the result may be to enhance North Korean dependency on Seoul and Beijing as safety valves against the prospect of renewal of US-(North Korea) confrontation", according to Scott Snyder, a Korea expert at the Council on Foreign Relations.
A Trump administration official, speaking on condition of anonymity, said the USA side was entering the talks with a sense of optimism and an equal dose of skepticism given North Korea's long history of developing nuclear weapons. Delegates were outlining specific goals for what the leaders should try to accomplish and multiple scenarios for resolving key issues, a senior U.S official said, adding that the meetings were also an ice breaker of sorts, allowing the teams to get better acquainted after decades of minimal contact between their nations.
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"I believe we're going to have a terrific success or a modified success", Trump said during a press conference last week with Japanese Prime Minister Shinzo Abe. "And it's my honor to be involved".
Trump and Kim will meet at the Capella Hotel on Sentosa Island at 9:00 a.m. Tuesday (9:00 p.m. ET on Monday).
The meeting carries not only potentially dire diplomatic risks, but high political stakes as well for a president who has framed the meeting in legacy-defining terms.
While there has been a wave of bipartisan voices looking to support the president's efforts to avert war in the Korean peninsula, there have also been concerns in foreign policy circles that the meeting will elevate Kim's status as a brutal dictator overseeing a regime complicit in horrendous human-rights abuses.
Turns out, North Korea's Dear Leader is not staying at the Fullerton Hotel as initially posited by The Washington Post. Only after their tête à tête will the President's top advisers - Pompeo, chief of staff John Kelly and national security adviser John Bolton - join him for an expanded bilateral meeting and working lunch.
But it was only Monday morning in North Korea that the government news agency reported that Kim was in Singapore, had met with the prime minister and would meet Trump on Tuesday. He has only publicly left his country three times since taking power after his father's death in late 2011 - traveling twice to China and once across his shared border with the South to the southern part of the Demilitarised Zone for recent summits with the leaders of China and South Korea, respectively. "Kim and Trump both seem to want the same thing: a dramatic reversal in the U.S".
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Germany and Canada have already threatened to raise their tariffs on US goods in response to Trump's tariffs. It may be that he'll harm US alliances and take the country down a path of economic harm.