A lip-reading expert has revealed what was said during the tense exchange between Donald Trump and Melania that went viral.

The remarkable footage captures the US President and First Lady engaged in an animated finger-pointing discussion through the windows of Marine One. The moment was filmed on the South Lawn on Wednesday evening.

The clip quickly spread across social media platforms, with users drawing parallels to the notable incident when Emmanuel Macron received a nudge from Brigitte in May. The news comes as Donald and Melania's unusual sleeping arrangements were compared to Hillary and Bill Clinton's.

Jeremy suggests that Trump was addressing the "escalator-gate" episode at the United Nations General Assembly this week, rather than voicing complaints about something Melania had done.

Speaking to the Daily Mail, Jeremy believes Melania declared: "You just continued..." Trump then responded: "It was unbelievable.", reports the Express US.

Melania then fired back with: "Just say it and leave it.."

Appearing taken aback, Trump then replied: "How can you do that..." Moments later, the prominent pair stepped off the helicopter and walked across the lawn holding hands.

The escalator malfunction at the UN General Assembly in Manhattan prompted Trump to post on Truth Social: "It's amazing that Melania and I didn't fall forward onto the sharp edges of these steel steps, face first. It was only because we were each holding the handrail tightly or, it would have been a disaster."

Earlier this year, after a video of Brigitte Macron playfully slapping her husband, French President Emmanuel Macron, aboard an aircraft went viral, Trump offered some advice.

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Fox News correspondent Peter Doocy asked Trump: "There was a video of the First Lady of France slapping her husband, Emmanuel Macron. Do you have any world leader-to-world leader marital advice?".

"Make sure the door remains closed," he responded. "That was not good. I spoke to him. He's fine. They're fine.

"They're two really good people. I know him very well, and I don't know what that was all about. But I know him very well, and they're fine."

It comes after the White House revealed the Secret Service would be investigating claims of "sabotage" at the UN during Trump's visit.

Karoline Leavitt, the president's press secretary, said the UN staffers were "basically plotting to set up" the US President.

She told Fox News that "the audio inside the room was much lower and different for the president of the United States than the previous speakers."