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Hello and welcome to News Hour from the BBC World Service.
We're coming to you live from London.
I'm James Menendez.
It is one of the quirks of a parliamentary democracy that the role of hosting a state visit in the UK falls to Well,
the head of state.
In other words, not the prime minister,
but King Charles who has no role in making government policy.
However, with that comes all the pageantry of the monarchy.
Guards in bare skin hats, ancient horse drawn carriages lavishly upholstered and so on.
All the things that President Trump, on his second state visit, is said to adore.
It also means that this time that it could all justifiably take place at the King's home,
Windsor Castle,
about 40 kilometres from central London and a safe distance from the thousands of people who took to the streets earlier to demonstrate against the visit.
More on that in a moment.
But first let's hear from Windsor about how the day unfolded and what it might achieve is our diplomatic correspondent,
James Landau.
The presidential helicopter Marine One arrived at Windsor just after midday,
touching down in the southern reaches of the castle grounds.