An attendee protects himself from the rain while waiting for US President Donald Trump and First Lady Melania Trump to greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Jim WATSON / AFP via Getty Images)

An attendee protects herself from the rain while waiting for US President Donald Trump and First Lady Melania Trump to greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Jim WATSON / AFP via Getty Images)

US Secret Service block a street near the White House before US President Donald Trump and First Lady Melania Trump greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Aaron Schwartz / AFP via Getty Images)

US Secret Service block a street near the White House before US President Donald Trump and First Lady Melania Trump greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Aaron Schwartz / AFP via Getty Images)

US Secret Service block a street near the White House before US President Donald Trump and First Lady Melania Trump greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Aaron Schwartz / AFP via Getty Images)

US Secret Service block a street near the White House before US President Donald Trump and First Lady Melania Trump greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Aaron Schwartz / AFP via Getty Images)

Guests wait in the rain for US President Donald Trump and First Lady Melania Trump to greet Britain's King Charles III and Queen Camilla for an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Jim WATSON / AFP via Getty Images)

UK and US flags fly near the White House, ahead of US President Donald Trump hosting Britain's King Charles III and Queen Camilla for a State Visit in Washington, DC, on April 28, 2026. (Photo by Aaron Schwartz / AFP via Getty Images)