On Thursday, Air Force One landed at London Stansted Airport, and US President Donald Trump descended its stairs to begin his four-day visit to Britain.
"I've been reading a lot about Brexit over the last couple of days and it seems to be turning a little bit differently where they're getting at least partially involved back with the European Union", he told reporters. You see what's going on throughout the world with immigration. "I think that's why they voted for Brexit". He added: "I think that's why Brexit happened".
Mr Trump has recently been under fire for his immigration police which saw the separation of immigrant families and caused wide-spread anger.
Nearly two million people signed a petition demanding he be banned from the United Kingdom because they believe he is sexist and racist and "Stop Trump" campaigners say he will face a "Wall of Sound" outside all the landmarks he visits because supporters will bang pots and pans.
The Marine One helicopter carrying US President Donald Trump and First Lady Melania Trump flies past the BT Tower before landing at Winfield House, the London residence of US ambassador Woody Johnson.
May will seek to put the tensions behind her when she hosts Trump later Thursday for a black-tie dinner with business leaders at Blenheim Palace, the birthplace of World War II prime minister Winston Churchill.
When asked about the demonstrations, he replied: "It's fine".
While she hopes the Trump visit will focus on trade and strengthening security ties, it is likely to be heavy on rhetoric about the transatlantic "special relationship" and short on specifics such as any details of a post-Brexit trade deal.
Activists inflate a giant balloon depicting US President Donald Trump as an orange baby in north London on July 10, 2018 ahead of a demonstration in London to coincide with the visit of the US president.
Downing Street insisted Mrs May welcomed Mr Trump's decision to "engage" with the Russian leader. The protocol is that if embassy staff are warned internally about possible threats, then the American public must be as well, she said.
Only one person, the digital entrepreneur and philanthropist Baroness Martha Lane-Fox, has publicly refused the invitation.
On Friday he will visit PM Theresa May at Chequers, set to be followed by a meeting with Her Majesty The Queen at Windsor Castle. This part of the visit is being considered private.
This is when huge protests will be held across the city, with 50,000 people expected to turn up on Friday afternoon - parading to Trafalgar Square through central London.
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