Trump had barely touched down in the UK before he fired off his first angry tweet.

On Monday morning, the president arrived in London for a three-day state visit. As the adverts from some broadcasters suggest, though, not everyone in the UK was exactly excited to see him.

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Firmly in the "not excited" category was London's mayor, Sadiq Khan.

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Clearly, Khan's comments didn't go unnoticed by the president. And never one to miss out on a good ol' Twitter battle, he hit back at Khan on Monday morning.

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As you can probably imagine, Trump's tweet elicited some fairly direct responses from certain Brits.

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It's going to be a long three days...

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TopicsDonald TrumpPolitics

(责任编辑：知識)