Britain's Queen Elizabeth II views a display of U.S. items of the Royal collection with U.S. President Donald Trump at Buckingham palace in London, Britain June 3, 2019. Tolga Akmen/Pool via REUTERS
Britain's Queen Elizabeth II greets U.S. President Donald Trump as he arrives for the Ceremonial Welcome at Buckingham Palace, in London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
U.S. President Donald Trump inspects an honour guard at Buckingham Palace, in London, Britain, June 3, 2019.
U.S. President Donald Trump and First Lady Melania Trump are seen at Westminster Abbey as part of their state visit in London, Britain June 3, 2019.
Ivanka Trump and Britain's Prince Harry, The Duke of Sussex review items from the Royal Collection at Buckingham Palace in London, Britain June 3, 2019. Tolga Akmen/Pool via REUTERS
U.S. President Donald Trump, his wife First Lady Melania, Britain's Queen Elizabeth, Britain's Charles, the Prince of Wales and Camilla, Duchess of Cornwall pose at the State Banquet at Buckingham Palace in London, Britain June 3, 2019. Jeff Gilbert/Pool via REUTERS
U.S. President Donald Trump and First Lady Melania Trump arrive for their state visit to Britain, at Stansted Airport near London, Britain, June 3, 2019.
U.S. President Donald Trump inspects an honour guard with Britain's Prince Charles at Buckingham Palace, in London, Britain, June 3, 2019.
U.S. President Donald Trump, First Lady Melania Trump and Britain's Queen Elizabeth pose at the State Banquet at Buckingham Palace in London, Britain June 3, 2019. Alastair Grant/Pool via REUTERS
Ivanka Trump and Jared Kushner attend a welcome ceremony at Buckingham Palace, in London, Britain, June 3, 2019.
U.S. President Donald Trump and First Lady Melania Trump meet with Britain's Queen Elizabeth at Buckingham Palace, in London, Britain, June 3, 2019.
A message from U.S. President Donald Trump and First Lady Melania Trump is seen in a guest book after they toured Westminster Abbey as part of their state visit in London, Britain June 3, 2019.
Britain's Queen Elizabeth II looks at a display of U.S. items of the Royal collection with U.S. President Donald Trump at Buckingham palace in London, Britain June 3, 2019. Tolga Akmen/Pool via REUTERS
U.S. President Donald Trump and First Lady Melania Trump pose with Britain's Prince Charles and his wife Camilla, Duchess of Cornwall at Clarence House, as part of a state visit in London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
U.S. President Donald Trump and Britain's Queen Elizabeth raise their glasses to make a toast at the State Banquet at Buckingham Palace in London, Britain, June 3, 2019. Dominic Lipinski/Pool via REUTERS
U.S. President Donald Trump and First Lady Melania Trump are seen at Westminster Abbey as part of their state visit in London, Britain June 3, 2019.
U.S. President Donald Trump meets Britain's Prince Charles as he arrives at Buckingham Palace, in London, Britain, June 3, 2019.
U.S. President Donald Trump inspects an honour guard at Buckingham Palace, in London, Britain, June 3, 2019.
Marine One lands at Buckingham Palace during U.S. President Donald Trump's state visit to Britain in London, Britain, June 3, 2019.
U.S. President Donald Trump and First Lady Melania Trump arrive for their state visit to Britain, at Stansted Airport near London, Britain, June 3, 2019.
U.S. President Donald Trump and Britain's Prince Charles during the Ceremonial Welcome at Buckingham Palace, in London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
U.S. President Donald Trump and First Lady Melania Trump are seen at Westminster Abbey as part of their state visit in London, Britain June 3, 2019. REUTERS/Carlos Barria - RC1C165E1300
U.S. President Donald Trump, First Lady Melania Trump and Britain's Queen Elizabeth review items from the Royal Collection at Buckingham Palace, in London, Britain, June 3, 2019.
U.S. President Donald Trump and First Lady Melania Trump tour Westminster Abbey as part of their state visit in London, Britain June 3, 2019.
U.S. President Donald Trump and First Lady Melania Trump tour Westminster Abbey as part of their state visit in London, Britain June 3, 2019.
Britain's Queen Elizabeth and U.S. President Donald Trump arrive at the State Banquet at Buckingham Palace in London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
First Lady Melania Trump and the Prince of Wales arrive at the State Banquet at Buckingham Palace in London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
Britain's Princess Anne and U.S. White House Adviser Jared Kushner arrive through the East Gallery during the State Banquet, on day one of the U.S. President's Donald Trump state visit, at Buckingham Palace, London, Britain, June 3, 2019. Victoria Jones/Pool via REUTERS
Secretary of State for Defence, Penny Mordaunt and John Michael Mulvaney arrive through the East Gallery during the State Banquet, on day one of the U.S. President's Donald Trump state visit, at Buckingham Palace, London, Britain, June 3, 2019. Victoria Jones/Pool via REUTERS
Britain's Queen Elizabeth II, Camilla, Duchess of Cornwall and U.S. first lady Melania Trump during the Ceremonial Welcome at Buckingham Palace, in London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
U.S. President Donald Trump tours Westminster Abbey as part of his state visit in London, Britain June 3, 2019.
Britain's Queen Elizabeth II views a display of U.S. items of the Royal collection with U.S. President Donald Trump at Buckingham palace in London, Britain June 3, 2019. Ian Vogler/Pool via REUTERS
Kellyanne Conway and Britain's Prince Edward, the Duke of Kent arrive through the East Gallery during the State Banquet, on day one of the U.S. President's Donald Trump state visit, at Buckingham Palace, London, Britain June 3, 2019. Victoria Jones/Pool via REUTERS
Royal Treatment: Trump’s UK state visit