The meeting will be held at the Capella Hotel, press secretary Sarah Huckabee Sanders tweeted.
In the lead-up to the summit, a significant number of journalists from all over the world, including South Korea, are coming to the city-state.
"We've reached a point where the summit is extremely fragile and can easily be tipped out of balance", Graham Ong-Webb, a research fellow at Singapore's S. Rajaratnam School of International Studies, told AFP.
"I don't want to sit here and say, 'I did this".
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It prompted threats of retaliation from the European Union on United States products before the policy was abandoned. Malmstrom is meeting US Trade Representative Robert Lighthizer in Paris today among other global trade chiefs.
His remarks were previously reported by The Wall Street Journal. Around 3,000 journalists flocked to Seoul for the inter-Korean summit on April 27. More than 2,500 people from the local and global news media are expected to cover the event in Singapore, according to the number of registrations received by the ministry of communications and information.
"Our two countries face a pivotal moment in our relationship, and it would be nothing short of tragic to let this opportunity go to waste", he said, adding that he believed North Korea was "contemplating a strategic shift".
"And the President will make his views known directly to him when we're in Singapore, and our focus will continue to be on denuclearisation", Sanders said.
Most Korean newspapers and broadcasters, including Chosun Ilbo, Hankook Ilbo, KBS and MBC, are sending a team of journalists to cover the summit.
A view of Capella Hotel on Sentosa Island in Singapore, June 4, 2018.
A group of tourists take a "wefie" with the Merlion statue in Singapore on Tuesday.