US President Donald Trump will join the Queen in Portsmouth to commemorate the 75th anniversary of the D-Day landings, on the final day of his UK state visit.
Theresa May will host 15 world leaders to honour the largest combined land, air and naval operation in history.
Figures from every country that fought alongside the UK will be attending.
Those countries have agreed a joint statement to mark the event, pledging to ensure the “unimaginable horror” of the Second World War is not repeated.
Called “the D-Day proclamation”, the 16 signatories – including the UK and the United States – commit to working together to “resolve international tensions peacefully”.
The UK prime minister will use the occasion to call for continued Western unity in tackling what she will call “new and evolving security threats”.
The commemorations to mark the Allied invasion of northern France come a day after Mr Trump had a series of political meetings as part of his three-day state visit to the UK.
The president used a TV interview to play down his earlier suggestion that the NHS would be included in post-Brexit trade talks between the US and the UK.
During a joint news conference with the UK prime minister, Mr Trump had said “everything is on the table” in future discussions between the countries.
But Health Secretary Matt Hancock was among several Conservative leadership candidates who said they would not allow the NHS to become part of any trade talks.
And later Mr Trump, in an interview by Piers Morgan for ITV’s Good Morning Britain, said he does not “see it being on the table”.
“Somebody asked me a question today and I said everything’s up for negotiation because everything is, but I don’t see that being… that’s something that I would not consider part of trade. That’s not trade,” he said.
He also told ITV that he would have “no problem” with meeting Jeremy Corbyn another time after earlier revealing he had turned down a request to meet the Labour leader who he called a “negative force”.
“I don’t know him, he wanted to meet, it was very tough to meet and probably inappropriate to meet to be honest with you… but I would, I certainly would, I’d have no problem with it,” he said.
Trump and what comes next
For any prime minister, handling a president like Donald Trump is like trying to hold on to a Ming vase walking across a recently polished, slippery parquet floor.
He’s a leader who glories in the unpredictable, who seems to wake up every morning wondering what controversy he can provoke, what headlines he can create.
His reason for being is therefore from the start in contrast with the stiff choreography of a state visit.
But No 10 will be relieved that the formalities with the PM were free of mishap. And, as Theresa May readies herself for the exit, Donald Trump, who has definitely embarrassed her in the past, didn’t repeat that habit.
Instead, he spoke warmly of her, suggesting that history may judge her much more kindly than the manner of her departure suggests.
But some of the most notable remarks were not related to the prime minister in any case, but to what’s next.
Whether you are overjoyed about Mrs May leaving or not, it is telling that the three names Donald Trump mentioned immediately when asked about the next leader were Boris Johnson, Jeremy Hunt, and Michael Gove, categorising them deliberately or not as the three most likely candidates to win the keys to No 10.
Tuesday saw protesters gathered in central London and other cities – including Glasgow, Edinburgh and Sheffield – to voice their opposition to President Trump’s visit.
Mr Corbyn – who boycotted Monday evening’s state dinner – was joined at the rally by members of other political parties, including the Liberal Democrats and the Green Party.
At the end of a day of meetings with the prime minister and a visit to the Churchill War Rooms, Mr Trump welcomed guests for a banquet at the US ambassador’s residence in Regent’s Park.
The Prince of Wales and the Duchess of Cornwall attended on behalf of the Queen, along with the prime minister and some members of her cabinet.
The US president is expected to meet Tory leadership hopefuls Jeremy Hunt and Michael Gove on Wednesday morning – he has already had a phone conversation with fellow candidate Boris Johnson – before his first official engagement in Portsmouth at 11:00 BST.
The Queen and the Prince of Wales will attend the commemorations on Southsea Common, along with representatives from every country that fought alongside the UK in the Battle of Normandy.
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It was the largest military operation ever attempted and marked the start of the campaign to liberate Nazi-occupied north-west Europe.
Troops from the UK, the US, Canada, and France attacked German forces on the coast of northern France, on 6 June 1944.
Joining Mrs May and Mr Trump will be French President Emmanuel Macron and German Chancellor Angela Merkel, as well as prime ministers from Australia, Belgium, Canada, Czech Republic, Denmark, Greece, Luxembourg, the Netherlands, Norway, New Zealand, Poland and Slovakia,
The last time the UK hosted this many world leaders outside a formal summit was the 2012 Olympics.
Members of the armed forces and more than 300 veterans, who are all over 90 years old, will also attend the event in Portsmouth – one of the key embarkation points on D-Day.
Following the commemorations, Mr Trump will fly to Shannon for his first visit to the Republic of Ireland as US president.
He will then hold a meeting with the Taoiseach (Irish prime minister) Leo Varadkar, before he goes to his golf resort in Doonbeg.