Pompeo said "any suggestion that the United States somehow lacks the technical expertise across government, or lacks it on the ground here in Singapore, is mistaken".
Sung Kim has taken the lead on policy negotiations with North Korea.
Trump has enjoyed all the attention attached to his unprecedented sit-down with Kim, basking in suggestions that he might be a candidate for a Nobel Peace Prize.
One top Trump adviser cast the move as a show of strength before the Kim meeting.
- North Korean and American delegations met at the Ritz Carlton., not once, but twice.
Mr Trump is set to finally come face to face with North Korean leader Kim Jong-Un as the summit gets underway at 11am AEST today (9am local time). The media reports Monday follow months of only the scantest of coverage of the plans for Kim to meet Trump, though his summits with South Korea's President Moon Jae-in and China's President Xi Jinping received major coverage soon after they had ended.
While no agenda has been officially announced, it is being speculated that bilateral relations between the two nations might also come up, as the U.S., as well as the United Nations, has put additional sanctions on North Korea in recent times following Kim Jong Un's repeated missile tests.
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James's Palace, and has seven godparents: Oliver Baker, Emilia Jardine-Paterson, Earl Grosvenor, Jamie Lowther-Pinkerton, the Hon. The siblings attended the match without their newborn brother, Prince Louis , who was born in April .
Lobster bisque, beef tenderloin and ice cream were on the lunch menu, and there was also an early birthday cake for Mr Trump, who turns 72 on Thursday. It heralded the summit as part of a "changed era". "We expect a fierce tug-of-war to continue between the two sides until tomorrow's summit ends, but we also expect some good outcome". The official was not authorized to speak publicly about internal deliberations and insisted on anonymity.
The two leaders are scheduled to have a working lunch with aides, Foz News reported.
"The main question is Kim Jong-un's level of seriousness", Mazarr said.
"The fact that I am having a meeting is a major loss for the US, say the haters & losers".
Pompeo did say the United States is "prepared to take what will be security assurances that are different, unique that America has been willing to provide previously".
THEIR ENTOURAGESTrump is to meet Singapore Prime Minister Lee Hsien Loong on Monday while Kim has no official agenda.
Just meeting Mr Trump will also give Mr Kim a recognition North Korea has long sought, setting him up as global player and the leader of a country worthy of respect.
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Trump and Kim will be making history here on Tuesday morning when they shake hands for the first time.
Trump has said he will know in the first minute whether or not he can get a deal with Kim.
Monday saw the Blue House official say the "very significant meaning" Kim-Trump meeting would be if the two confirmed each other as "credible partners".
The official cautioned, however, that schedule could always change if meeting goes well and there is more to discuss. "You would start at least a dialogue, because, you know, as a deal person, I have done very well with deals".
The North has faced crippling diplomatic and economic sanctions as it has advanced development of its nuclear and ballistic missile programs.
Kim has offered to deal away his nuclear arsenal but doubts remain over whether he is truly willing to give up his nukes or is using the summit to weaken USA -led sanctions against his country.
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So far he’s performing as expected, notching impressive rebounding and blocking numbers in heavy Summer League minutes. It’s undeniable at this point that this rookie class is going to generate a lot of attention for a long time to come.