London (CNN) Donald Trump and the Prince of Wales have developed a "good working relationship" since the US President's state visit to the UK this summer, a Clarence House spokesman has told CNN.

Trump and the first lady are in London for a NATO summit and will be meeting with Prince Charles and Camilla, the Duchess of Cornwall, at Clarence House for tea on Tuesday.

The pair are at odds over the issue of the environment, given Charles' passionate and lifelong environmentalism and Trump's well-known climate-change skepticism.

Trump later told ITV that the meeting had been scheduled to last 15 minutes, but continued for an hour and a half as the pair discussed climate change. "He did most of the talking," the President said.

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