King Charles III arrived in the United States for an official visit at a moment of strain in U.S.–U.K. relations, driven by the escalating conflict surrounding Iran. At the White House, the British monarch and Queen Camilla were received by President Donald Trump and First Lady Melania Trump.

The visit officially began on April 27 in Washington, D.C. The following day, the King is scheduled to address a joint session of Congress—only the second time in history a British monarch has spoken before the U.S. legislature. The first such address was delivered by Queen Elizabeth II in 1991.

After Washington, the royal delegation will travel to New York City to attend memorial events honoring the victims of the September 11, 2001 terrorist attacks.

Heightened Security and Political Backdrop

This marks the first visit by a British monarch to the United States since 2007. It comes under tightened security following a shooting on April 25 at the Washington Hilton, where the annual White House Correspondents’ Association dinner took place with the president in attendance.

A Delicate Diplomatic Mission

According to Associated Press, the visit carries a sensitive diplomatic objective: to reinforce the long-standing partnership between Washington and London, which has recently come under pressure due to diverging positions on the U.S. and Israel’s conflict with Iran.

In March, U.K. Prime Minister Keir Starmer declined to authorize the use of British military bases for strikes on Iran and refused to deploy naval forces to the Strait of Hormuz.

Public rhetoric has also sharpened. In an interview with The Telegraph, Donald Trump stated that the British navy would be unable to secure the region, citing outdated capabilities. He also described NATO allies as ineffective in addressing the Iran conflict and indicated he is seriously considering the possibility of the United States withdrawing from the alliance.

In response, Keir Starmer told ITV News that he is “fed up” with volatility in U.K. energy bills, attributing it to global political actions, including those of both Russia and the United States. In a column for The Guardian, he emphasized the government’s commitment to investing in domestic energy infrastructure to reduce dependence on external forces influencing gas prices.

At the same time, Donald Trump has maintained that political disagreements will not affect the visit, noting that King Charles III is not involved in NATO matters and describing him as “a great guy” and “a friend.”