The King's state visit to the United States was a masterclass in diplomatic charm, but the real question is whether the goodwill generated can translate into tangible improvements in UK-US relations.
During his four-day tour, King Charles delivered carefully crafted speeches that praised American resilience and subtly challenged the isolationist undertones of the Trump administration. He reminded Congress that "the challenges we face are too great for any one nation to bear alone," a direct counter to the 'America First' doctrine.
British diplomats hoped the visit would at least reset the tone between London and Washington, given deep disagreements over Iran, NATO, Ukraine, trade, and Trump's personal attacks on Prime Minister Sir Keir Starmer. The King, described by a former UK ambassador as a "stabiliser and shock absorber," used humour and historical references to lower the temperature.
Republican Senator Lindsey Graham noted the King's address gave a "much needed morale boost" to US politicians. However, the visit was not without hiccups, including leaked remarks from the UK ambassador questioning the 'special relationship' and Trump's claim that the King agreed with him on Iran's nuclear programme.
Ultimately, the success of the visit hinges on whether the UK can bolster its defence spending and avoid political cheap shots, and whether the Trump administration will embrace the value of alliances over unilateral action. As one analyst put it, "No amount of royal soft power will reassure US generals worried about the UK's lack of hard power."
The King has done his part; now it is up to the politicians to build on the foundation he has laid.