A staff member distributes umbrellas to seats before US President Donald Trump, First Lady Melania Trump, Britain's King Charles III and Queen Camilla participate in an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Mandel NGAN / AFP via Getty Images)

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

US Secretary of State Marco Rubio shakes hands with UK Foreign Secretary Yvette Cooper before US President Donald Trump, First Lady Melania Trump, Britain's King Charles III and Queen Camilla participate in an arrival ceremony on the South Lawn of the White House in Washington, DC, on April 28, 2026. (Photo by Mandel NGAN / AFP via Getty Images)

WASHINGTON, DC - APRIL 28: People wait in the rain before a state arrival ceremony with King Charles III and Queen Camilla on the South Lawn of the White House on April 28, 2026 in Washington, DC. President Trump and King Charles III will participate in a number of activities including a bilateral meeting in the Oval Office, with the king later addressing a joint meeting of the United States Congress. (Photo by Kevin Dietsch/Getty Images)

WASHINGTON, DC - APRIL 28: Workers apply the presidential seal to the podium before a state arrival ceremony with King Charles III and Queen Camilla on the South Lawn of the White House on April 28, 2026 in Washington, DC. President Trump and King Charles III will participate in a number of activities including a bilateral meeting in the Oval Office, with the king later addressing a joint meeting of the United States Congress. (Photo by Kevin Dietsch/Getty Images)

WASHINGTON, DC - APRIL 28: Position markers for U.S. President Donald Trump and King Charles III are seen on the stage during a state arrival ceremony with King Charles III and Queen Camilla on the South Lawn of the White House on April 28, 2026 in Washington, DC. President Trump and King Charles III will participate in a number of activities including a bilateral meeting in the Oval Office, with the king later addressing a joint meeting of the United States Congress. (Photo by Andrew Harnik/Getty Images)

WASHINGTON, DC - APRIL 28: U.S. Military Honor Guard march during a state arrival ceremony with King Charles III and Queen Camilla on the South Lawn of the White House on April 28, 2026 in Washington, DC. President Trump and King Charles III will participate in a number of activities including a bilateral meeting in the Oval Office, with the king later addressing a joint meeting of the United States Congress. (Photo by Kevin Dietsch/Getty Images)

WASHINGTON, DC - APRIL 28: United States Marine Corps Honor Guard march during a state arrival ceremony with King Charles III and Queen Camilla on the South Lawn of the White House on April 28, 2026 in Washington, DC. President Trump and King Charles III will participate in a number of activities including a bilateral meeting in the Oval Office, with the king later addressing a joint meeting of the United States Congress. (Photo by Kevin Dietsch/Getty Images)