"The American people are counting on us to get this right", Pompeo said in his opening remarks for a House Foreign Affairs Committee hearing.
His statement followed Trump's suggestion on Tuesday that the meeting could be delayed or scrapped entirely.
"We will know next week about Singapore", he told reporters at the White House before departing for NY.
Trump did not say, however, whether the preparatory talks between USA and North Korean officials in coming days were expected to clarify the situation.
The US delegation, which includes White House Deputy Chief of Staff Joseph Hagin and deputy national security adviser Mira Ricardel, was being dispatched after Trump said on Tuesday there was a "substantial chance" the summit would be called off amid concerns Pyongyang is not prepared to give up its nuclear arsenal.
It follows a historic meeting between the leaders of the Koreas in April.
North Korea cancelled high-level talks with South Korea, saying the South's joint military exercises with the USA - which it had previously said it would tolerate - were a "provocation". But the North unexpectedly pulled out of planned peace talks with South Korea last week, objecting to U.S. Libya's longtime autocratic leader Moammar Gadhafi was killed several years later after a Western-backed military intervention. He said Bolton's comments were alluding to the failure of past disarmament deals with North Korea "where in exchange for act x the United States sends a check across the transom", Pompeo said. "If we go, I think it'll be a great thing". On Wednesday it was escorting a group of worldwide reporters, including an Associated Press Television crew, to witness the closure of its atomic test site.
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Mount Pinatubo last erupted in 1991, killing more than 350 people in what became the second-largest eruption of the 20th century. Their hope is to pinpoint warning signs that could be used to predict phreatic eruptions in Hawaii and elsewhere.
"That model would take place if we don't make a deal, most likely".
Many observers had argued before Mr Trump met Mr Moon that there was too much at stake for Washington and Pyongyang not to proceed with the Singapore summit.
Pompeo said on Wednesday the United States is prepared to walk away from nuclear negotiations with North Korea if the summit heads in the wrong direction.
He said he had raised it with Kim "and it will be part of the discussions as we move forward".
In requesting the exemption, Gafoor said, "The summit will serve as an opportunity to advance the objective of a peaceful resolution of the DPRK nuclear issue and the establishment of peace and stability on the Korean peninsula and in the region".
Pompeo said he was "very hopeful" the summit would take place but said the decision was ultimately up to Kim, who the secretary of state has met twice in less than two months. He said they had discussed their mutual goals for the talks.
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