In pictures: Trump and Melania meet royals at Windsor
Reuters
President Trump was greeted by the King and Queen as well as other senior royals at Windsor Castle.
It is his second state visit to the UK and is accompanied by the usual pomp and pageantry.
Bands played during the final preparations for the ceremonial greeting and troop inspection by the King and President TrumpChris Jackson/Getty Images
Bystanders took photographs as the Marine One helicopter departed from Winfield House, the US Ambassador's residence in central LondonJose Sarmento Matos/Bloomberg via Getty Images
President Trump disembarked from Marine One at Windsor Castle alongside First Lady Melania TrumpAaron Chown/WPA Pool/Getty Images
The pair were greeted by the Prince and Princess of WalesIAN VOGLER/POOL/AFP
The first lady arrived at Windsor Castle wearing a wide-brimmed purple hatAARON CHOWN/POOL/AFP
All four walked to meet with King Charles and Queen CamillaAARON CHOWN/POOL/AFP
For the second time, Donald Trump was greeted by a British monarch on a state visitIan Vogler/Daily Mirror/PA Wire
The first lady, the Queen and the Princess of Wales chatted in a separate group nearbyAaron Chown/PA Wire
President Trump shook hands with King Charles and the two were in deep conversation outside Windsor CastleIan Vogler/Daily Mirror/PA Wire
The Trumps, the King, the Queen and the Prince and Princess of Wales then stepped into the royal carriagesChris Jackson/Getty Images
King Charles and President Trump were first in the procession, travelling in the Irish State CoachSamir Hussein/WireImage
Queen Camilla and First Lady Melania Trump were together in the Scottish State CoachToby Melville/PA Wire
In the next carriage - a semi-state landau model - were the Prince and Princess of Wales, joined by the US ambassador and his wifeDavid Hartley/Getty Images
The 1.8km (1.1 mile) procession through Windsor grounds was closed to the publicSamir Hussein/WireImage
The carriages arrived at the Quadrangle where a British Army guard of honour was ready for inspectionGetty Images
The American and British national anthems were performed by the Massed Band of the Grenadier Guards, Coldstream Guards and the Scots GuardsGetty Images
King Charles and President Trump inspected the guard of honourKevin Lamarque/Reuters
They chatted as they made their way aroundAnna Moneymaker/Getty Images)
Kirsty Wigglesworth/WPA Pool/Getty Images
In central London, away from the pomp and pageantry in Windsor, a large anti-Donald Trump protest gathered close to BBC HQ for the beginning of a demonstrationANDY RAIN/EPA
The protesters gathered at the Parliament Square to take part in a 'Trump Not Welcome' rallyHannah McKay/REUTERS
President Trump and First Lady Melania Trump were welcomed by the King and Queen at Windsor Castle's Green Drawing RoomAaron Chown/WPA Pool/Getty Images
A special exhibition had been laid out to celebrate the UK's relationship with the USAaron Chown/WPA Pool/Getty Images
Among the items on display was the Generall Historie of Virginia, New England and the Summer Isles by John Smith, published in 1624Aaron Chown/WPA Pool/Getty Images
The First Lady kept her hat on indoors, unlike the Queen who removed hersKevin Lamarque/Reuters
Next on the itinerary for the president and first lady was a trip to St George's Chapel where a number of former monarchs are buriedKevin Lamarque/REUTERS
They were greeted by the Dean of Windsor, the Rt. Rev. Christopher Cocksworth, and the Chapter Clerk, Miss Charlotte ManleyAaron Chown/PA Wire
While there, they laid a wreath at the tomb of Queen Elizabeth IIAnna Moneymaker/Getty Images
The pair were also given a brief tour of the chapel, and saw Henry VIII's vaultAndrew Caballero-Reynolds/Getty Images
Choristers sang the first movement from Vivaldi's Gloria for them before they return to Windsor CastleEvan Vucci/Getty Images
The United States Army Old Guard Fife and Drum Corps pictured preparing for the performanceAndrew Matthews/PA Wire
Queen Camilla, King Charles, President Donald Trump and First Lady Melania Trump observed the rendition of the Beating RetreatAndrew Matthews/REUTERS
The military ceremony originated in the early years of organised warfareJordan Pettitt/PA Wire
Two hundred UK and US musicians performed for their majesties and their American guestsJordan Pettitt/PA Wire
The president and first lady were seated alongside the King and Queen for the performanceJonathan Brady/REUTERS
The Band of His Majesty's Royal Marines Portsmouth, the Band of the Scots Guards, British Army and the Central and College Bands of the Royal Air Force performedAndrew Matthews/REUTERS
Prime Minister Sir Keir Starmer and Lady Victoria Starmer also attended the special military musical performanceJonathan Brady/PA Wire
The red, blue and white smoke from the Red Arrows flypast filled the skies over Windsor CastleToby Melville/REUTERS