During the media interview, Mr Lee said that Singapore had committed a lot of resources to the summit's logistics and security because of the profile of the meeting and the nature of what is being discussed.
"I love my friend Lindsey Graham, but I think first we have to give a chance at peace, and that's why we outlined very clearly what a successful agreement would be", Menendez said.
The Trump-Kim meeting be the first between a sitting US president and a North Korean leader. "Both the American as well as the North Koreans are pleased with the arrangements, we're all set to go and things will start happening within the next 24 hours", he said.
Washington hopes the summit will kick-start a process that eventually sees Kim give up his nuclear weapons, read the BBC report, adding that the U.S. wants North Korea to get rid of its nuclear weapons in an irreversible manner that can be verified internationally.
At the hotel lobby, grim-faced North Korean security guards warned other hotel guests not to take pictures as Kim walked to his Mercedes Benz limousine.
Aboard Air Force One en route to Singapore, Trump tweeted, "I look forward to meeting [Kim] and have a feeling that this one-time opportunity will not be wasted!" -North Korea nuclear standoff with a peace treaty.
Another Pyongyang report quoting Kim Yong-nam, the nominal head of state, as telling leader Kim to achieve outstanding outcomes from the summit with the USA has also drawn attention.
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Macron said: "We'll all be behind him to support this essential initial initiative in the fight for global denuclearization". Going into the summit, Mr Trump was at odds with other leaders on issues such as trade, Iran and climate change.
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North Korean soldiers keep watch toward the south in the village of Panmunjom, South Korea, on April 17.
Kim arrived at Singapore's Changi Airport and was also greeted by Balakrishnan.
Menendez spoke Sunday on ABC's "This Week" as President Donald Trump arrived in Singapore ahead of Tuesday's talks with Kim.
The two leaders are scheduled to meet for the first time on Tuesday at the Capella Hotel on Sentosa Island, where the process regarding denuclearisation of North Korea may kick-start in exchange for economic aid.
Kim's chief of staff was spotted in Beijing last week after wrapping up talks with USA officials in Singapore which had included security discussions.
But then again, nothing about this summit is routine. The United States stations 28,500 troops in South Korea, a legacy of the Korean War.
Despite the initial high stakes of a meeting meant to rid North Korea of its nuclear weapons, the talks have been portrayed by Trump in recent days more as a get-to-know meeting. North Korea has said it's willing to deal away its entire nuclear arsenal if the United States provides it with a reliable security assurance and other benefits.
However, last week, Trump re-instated the summit after meeting with Kim's top aide, Central Committee of the Workers' Party of Korea Vice Chairman Kim Yong Chol, at the White House.
Menendez also stresses that getting a nuclear deal with North Korea will not be the hard point, noting that several previous presidents were able to strike deals only to see them fall apart.