The unprecedented gathering marks the first time a United States president and a North Korean leader have ever met.
The men greeted each other with extended hands in front of a row of US and North Korean flags.
After shaking hands for cameras, the two leaders gathered for a one-on-one private chat.
The President patted the North Korean on the back and later placed his hand Jong-Un's shoulder before the private discussion.
"I feel really great. We'll have a great discussion," Trump said at the beginning of the meeting. "This will be tremendously successful," he continued. "We will have a terrific relationship"
Jong-Un also touched on the longstanding hostility between North Korea and the United States.
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"There were a lot of obstacles on the way here," he said, "but we overcame them all."
Trump then shook his head in agreement.
Just minutes before his meeting, Trump tweeted that his economic advisor Larry Kudlow suffered a heart attack and is now recovering at Walter Reed Medical Center in Bethesda, Maryland.
Kudlow’s wife Judy told The Washington Post that her husband is “doing fine” thanks to “fabulous” doctors.
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