"We're prepared to take actions that will provide them sufficient certainty that they can be comfortable that denuclearisation isn't something that ends badly for them", he said.
Mr Kim has an "unprecedented opportunity" to change the trajectory of the bilateral relationship and bring peace and prosperity to North Korea, he said.
In making final preparations for the Kim summit, Trump spoke by phone Monday with interested parties in the region, South Korean President Moon Jae-in and Japanese Prime Minister Shinzo Abe.
The South Korean government said in a statement that Moon offered his assessment of Kim and wished the US president an early happy birthday.
Asked by a reporter how he felt about the summit, Trump said: "Very good".
North Korea must take "concrete" steps towards denuclearisation before benefiting from any relaxation of worldwide sanctions, Downing Street has said.
Moon has expressed hope that the summit will lead to a three-way declaration also including Seoul to formally end the 1950-53 Korean War.
"North Korea has previously confirmed to us its willingness to denuclearise and we are eager to see if those words prove honest".
Actually, says another group, there will indeed be disarmament, a peace treaty ending the Korean War and North Korea's emergence as a contributing member of the worldwide community - but just not right now.
For the North, Kim Jong Un has already won a huge propaganda bonus by merely having the summit and sitting down as an equal with the US president, an accomplishment his father and grandfather sought but could never realize.
The North has faced crippling diplomatic and economic sanctions as it has advanced development of its nuclear and ballistic missile programs. Laboriously negotiated past nuclear deals, considered breakthroughs at the time, broke down on North Korea's extreme sensitivity to allowing in outsiders to look at whether they're dismantling their nuclear facilities, many of which are thought to be hidden.
"We anticipate that they will come to their logical conclusion even more quickly than we anticipated", Mr Pompeo said.
He further added that the United States remained "committed to the complete, verifiable, irreversible denuclearisation of the Korean peninsula".
Pompeo traveled twice to Pyongyang in recent months to lay the groundwork for Trump's meeting, becoming the most senior member of Trump's team to spend time with Kim face to face.
However, future investment in North Korea would not be without its risks.
Trump's lashing out at the European Union and Trudeau - who Trump's advisers said had stabbed him in the back - comes after he has repeatedly praised Kim. Tuesday's meeting could pave the way toward a "new era of prosperity, security and peace", Trump said.
Bandow noted that American companies could also turn to North Korea for low-priced manufacturing, which neighbors - like China and South Korea - already benefit from.