His statement follows a report from the New York Times, which criticized the White House for lacking a scientific advisory team.
Today, President Trump and North Korean leader Kim Jong Un signed a joint statement committing to the recovery and returning of remains of USA military personnel missing in action and presumed dead from the Korean War.
"It is the case that we are prepared to make security assurances necessary for the North Koreans to engage in that denuclearization", stated Pompeo.
It took months to bring North Korean leader Kim Jong-un to negotiate the start of denuclearization.
China was not a direct party to the summit but Mr Kim met President Xi Jinping twice in the run-up, and even borrowed an Air China 747 to get to Singapore.
The 1994 deal included detailed commitments from North Korea to close plutonium-producing nuclear reactors and secure spent fuel rods, so they couldn't be turned into weapons grade fuel.
If Mattis was aware that Trump was going to announce a suspension of military exercises, he apparently did not share that information with the South Koreans or with the military organisation most directly affected: US Forces Korea.
He said Trump had "squandered USA prestige" by meeting with Kim.
Kim agreed to the "complete denuclearisation of the Korean Peninsula", a stock phrase favoured by Pyongyang that stopped short of long-standing United States demands for North Korea to give up its atomic arsenal in a "verifiable" and "irreversible" way.More news: Apple Is Trying To Get People To Use Their Phones - Less
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Speaking later as he flew out of Singapore bound for the U.S. territory of Guam - towards which Pyongyang a year ago threatened to lob missiles - Trump said he meant to hold North Korea to its word on denuclearization. "President Trump has said in the past that all his predecessors have been played, which is true, but he's being played at another level", he said.
Trump added in an interview with ABC News that he had questioned what the exercises cost, noting that "we're flying planes in from Guam, we're bombing empty mountains for practice".
The Yomiuri ShimbunFamily members of 12 victims of North Korea's abductions of Japanese nationals, who have not been able to return to Japan, intently watched the U.S.
The U.S. and North Korea have already agreed, in some form, to each of the points listed in the joint statement.
From 1950 to 1953 the Korean War waged on.
So we got our hostages back, but they've blown up one of their sites, one of their testing sites, their primary testing site, in fact some people say their only testing site, they are getting rid of a missile, which isn't in the document, that was done afterwards, they're getting rid of a missile testing site - they're doing so much now.
Trump added that the United States has "done exercises with South Korea for a long time", but that it would be "inappropriate" to continue while hammering out details to their deal.
However, over the past 24 years, normal diplomatic procedures had repeatedly failed to open any effective negotiating door with North Korea, Stoffer recalled.
President Donald Trump celebrated his historic summit with North Korea's leader with remarks that twisted history and raised false hope that the remains of all missing Americans from the Korean War will be coming home.
President Donald Trump's abrupt announcement that he will suspend US military drills in South Korea appeared to catch the Pentagon and the Seoul government flat-footed, and it contradicted a pillar of Defense Secretary Jim Mattis' campaign to make USA troops more combat-ready.