US President Donald Trump had barely touched down in the UK before setting the country ablaze, as he insulted the London Mayor's crime reduction record - and his height.
His irate tweets about Sadiq Khan marked the beginning of an eventful state visit, in which he met various members of the Royal Family, as well as numerous ministers.
While many are preparing to protest against the President during his visit to London, egged on by Labour leader Jeremy Corbyn, others have advised British people to remain polite.
Tonight, he has fired up his iPhone again, and addressed the Royal Family, protesters, the Fake News Media and a post-Brexit trade deal in two quick-fire tweets.
Here is a run-down of his day so far.
Trump touches down in the UK and insults the London Mayor
Never one to make a quiet entrance, the President decided to mark his entry by sending a series of insulting tweets about Khan.
Khan finds an unlikely ally - health minister Matt Hancock
While many Labour MPs rallied to defend their colleague, Khan found some allies across the aisle, including Matt Hancock, who said he is "proud we have the first Muslim mayor of a Western city".
Trump is greeted by Foreign Secretary Jeremy Hunt
Hunt seemed pleased to see the President, greeting him with a grin.
The first thing Trump does when he gets to England? Sample the TV on offer
He tweeted his displeasure that he had to watch CNN to keep up-to-date with US news.
Corbyn asks the country to protest against the President
Corbyn decided to welcome Trump to the UK in his own special way - advising the country to attend the protest.
But not everyone agreed with him
MPs Nick Boles and Priti Patel were among those who said the President should be treated with politeness and respect.
Trump meets the Royal family
Trump met the Queen, Prince Philip, Prince Charles and the Duchess of Cornwall. Here is what the official Royal family Twitter account had to say:
Did he fist-bump the Queen?
It could be the angle of the picture, but many on Twitter wondered whether he and the Queen had an unorthodox greeting.
The President greets the soldiers as he inspects them alongside Prince Charles
And gets to see some precious artifacts, which he is shown by the Queen
Khan has his own message for Trump...
The Mayor recorded a video with Elle magazine, criticising the President's record on women's rights.
Pro-Trump activists shout abuse at the media
'Haven't seen any protests yet, but I'm sure the Fake News will be working hard to find them'
Trump's visits do always seem to bring out weird behaviour
Except for Larry the cat, who is carrying on as usual