The US President delivered an impromptu speech during a reception held at his private Mar-a-Lago club in Florida on Saturday.
The Republican had not long finished a press conference with Japanese Prime Minister Shinzo Abe.
The briefing was held at Mr Trump’s Palm Beach resort after claims North Korea had “successfully” fired a ballistic missile into the Japanese sea.
Donald Trump gatecrashed the wedding at his Mar-a-Lago club on Saturday
I said to the prime minister of Japan, I said, ‘Come on, Shinzo, lets go over and say hello.’
A short while later, Mr Trump and Mr Abe reportedly stepped into the wedding which was held on the same grounds.
In the video, the US President can be heard wishing the couple well, saying: “I saw them, out on the lawn today and I said to the prime minister of Japan, I said, ‘Come on, Shinzo, let's go over and say hello.’
“It’s an honour to be with you and you really are a special, beautiful couple.”
The US President had been on the grounds with the Japanese Prime Minister
According to New York Magazine, the wedded couple was Carl Henry Linder and Vanessa Jane Falk.
The groom is the son of the billionaire chief executive of American Financial Group.
The wedding reception was taking place in the Grand Ballroom. Mr Trump designed and built the space himself after purchasing Mar-a-Lago in the 1980s, CNN reports.
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The president posed for photos with the bride and her bridesmaids, who mimicked his signature thumbs-up stance.
“They’ve been members of this club for a long time,” Mr Trump said alluding to the newlyweds.
“They’ve paid me a fortune,” he joked.
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Earlier on Saturday, both the Japanese Prime Minister and US President played a round of golf at the prestigious resort.
Journalists were banned from photographing the event, however, Mr Trump’s aides seized the opportunity to snap their own pictures on the private course.
A photo posted on Donald Trump’s official Twitter account, showed the pair high-fiving, with an American flag waving in the distance.
“Having a great time hosting Prime Minister Shinzo Abe in the United States,” the post read.
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