Members of the US Secret Service stand watch on the roof of the White House 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)

(L/R) UK Foreign Secretary Yvette Cooper, White House Chief of Staff Susie Wiles, US Commerce Secretary Howard Lutnick, Secretary of Treasury Scott Bessent, Secretary of State Marco Rubio, Second Lady Usha Vance, and Vice President JD Vance look on 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 HENRY NICHOLLS / POOL / AFP via Getty Images)

(LR) US Secretary of State Marco Rubio, Defense Secretary Pete Hegseth, Treasury Secretary Scott Bessent and White House Chief of State Susie Wiles wait for 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 Brendan SMIALOWSKI / AFP via Getty Images)

US Secretary of State Marco Rubio (R) speaks with Vice President JD Vance (R) and his wife Usha Vance before 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 Jim WATSON / AFP via Getty Images)

(From Center L/R) US Secretary of Treasury Scott Bessent, Secretary of State Marco Rubio, Second Lady Usha Vance, and Vice President JD Vance look on 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 HENRY NICHOLLS / POOL / AFP via Getty Images)

US Defense Secretary Pete Hegseth and Treasury Secretary Scott Bessent speak before 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 Jim WATSON / AFP via Getty Images)

(L/R) US Vice President JD Vance, Second Lady Usha Vance, Secretary of State Marco Rubio and Defense Secretary Pete Hegseth wait for 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 Brendan SMIALOWSKI / AFP via Getty Images)

(L/R) US Secretary of State Marco Rubio and US Secretary of Treasury Scott Bessent arrive 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)