Kim had agreed in principle to "complete denuclearization of the Korean peninsula" but United States intelligence agencies have said the country's nuclear program has continued.
"If I had not been elected President of the United States, we would right now, in my opinion, be in a major war with North Korea", he said as some of the members of congress laughed while other expressed their clear frustrations with the statement.
Although he described his relationship with North Korean leader Kim Jong-un as "a good one", he said "much work remains to be done".
The president said he would meet with Kim in Vietnam on February 27 and 28.
For Donald Trump too, Vietnam is a safe place to meet.
SAUL LOEB via Getty Images President Donald Trump first met with North Korean leader Kim Jong Un in June 2018.
Denuclearizing North Korea is something that has eluded the US for more than two decades, since it was first learned that North Korea was close to acquiring the means for nuclear weapons.
"The miracle could be yours", Pompeo said, addressing Kim.
On Wednesday, Stephen Biegun, Washington's envoy for North Korea, was scheduled to hold talks in Pyongyang to map out what he called "a set of concrete deliverables" for the second meeting.
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North Korea was also listed among the nations that "have all used chemical weapons over the past two years, which threatens global norms and may portend future use".
Trump said the United States spent a fortune on a base in Iraq.
The country could also pose as a good example for North Korea because it hasn't become a liberal democracy to be economically successful.
Trump voiced guarded hope that intensifying negotiations with Afghanistan's Taliban would bring for a "possible political solution" to end the longest-ever U.S. war.
Iraqis in the capital Baghdad said USA army forces have been walking around the city accompanied by the Iraqi army, Al-Khaleej Online reported.
"They stopped nuclear testing, but they've made no move at all towards denuclearization".
Director of National Intelligence Dan Coats told the Senate Intelligence Committee last week that the intelligence committee assesses North Korea "will seek to retain its WMD capabilities and is unlikely to completely give up its nuclear weapons and production capabilities because its leaders ultimately view nuclear weapons as critical to regime survival".
"We do not know whether we will achieve an agreement - but we do know that after two decades of war, the hour has come to at least try for peace", he said.
Trump has largely downplayed such reports.