On Friday, as Melania Trump will accompany Philip May, UK PM Theresa May's husband, in visiting schoolchildren and veterans, Donald Trump will once again head outside the city to attend a military demonstration with his UK counterpart.
"At the same time, we will not compromise our fundamental values of equality, diversity and human rights, and we expect these values to be made clear during the presidential visit to the UK".
Mr. Trump landed in London on Thursday afternoon for a four-day visit that includes tea with the Queen at Windsor Palace, a black-tie dinner at Winston Churchill's birthplace and a few rounds of golf in Scotland.
Referring to the separation of undocumented parents and children, they wrote: "It is with great sadness that we have followed reports of events in recent months which have seen families ripped apart and children placed in cages".
Mr Trump had joked earlier this week that his meeting with Vladimir Putin in the Finnish capital Helsinki on Monday "may be the easiest" part of his European trip. More are planned for the second day of Mr Trump's visit.
A giant baby Trump blimp is set to fly over London during the USA president's visit to the UK.
Protesters were expected to rally during his visit.
Gatherings and rallies are planned across the United Kingdom from Thursday, when Mr Trump is expected to touch down in Britain.
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"I think whenever his detractors go after him, it makes him double down and it actually encourages him to keep going and prove everybody wrong", she said. Trump and Putin, who have never met for an official summit, will hold three sessions before the US president returns to Washington, D.C., early Tuesday.
Russia, Brexit and the Middle East are set to top the agenda.
The exterior of The Trump Arms public house, formally named The Jameson, which has embraced the arrival of US President Donald Trump for a visit by changing its name and decorating its interior with Trump memorabilia, is seen in West London on July 12, 2018.
Mrs May noted that more than one million Americans work for UK-owned firms, telling Mr Trump: "As we prepare to leave the European Union, we have an unprecedented opportunity to do more".
May hopes Trump, who landed at Stansted airport before flying by helicopter to the U.S. ambassador's London residence, will help to accelerate a future free trade deal, though his public comments on Brexit cast a shadow over the visit.
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"I think that those people, they like me a lot and they agree with me on immigration, and I think that's why they had Brexit in the first place-because of immigration", he said.
Like this go-round, protesters promised widespread backlash back in February amid the president's plans to travel to London for the grand-opening of a new USA embassy.
The two leaders will hold talks the following day at Chequers, the 16th-century manor house which is the prime minister's official country residence which will focus on Russian Federation, trade, Brexit and Middle East.