Can King Charles save the ever-fracturing ‘special relationship’ after Trump anger at Starmer over Iran war?

The trip began in Washington, D.C., where King Charles and Queen Camilla were greeted by President Donald Trump and Melania Trump for a private tea.(Anna Moneymaker/Getty Images)

“King Charles has the opportunity, through personal diplomacy, to create anew beginning with Donald Trump,” Mendoza said.

Britain’s balancing act became clearer Monday when Deputy Minister Stephen Doughty publicly rejected U.S.blockade tactics against Iran, while still backing Washington’s broader effort to secure maritime traffic through theStrait of Hormuz.

“While the U.K.doesn’t support the U.S.blockade, it supports working with the United States and others to reopen the Strait of Hormuz,” Doughty said ahead of a U.N.Security Councilmeeting, according to The Associated Press, warning Tehran cannot be allowed to hold “the rest of the world to ransom.”

The split underscores London’s effort to support U.S.security goals without fully endorsing Trump’s “economic fury” strategy, which aims to strangle Iran’s economic lifelines through aggressive maritime pressure.

That policy divergence has intensified scrutiny over whether Charles’ visit is now functioning as adiplomatic pressure valve.

A White House spokesperson emphasized the visit as a sign of enduring personal rapport between the president and the monarch.“President Trump has always had great respect for King Charles, and their relationship was further strengthened by the president’s historic trip to the United Kingdom last year,�“The president enjoyed welcoming their majesties to the White House, and he looks forward to more special events throughout the week.”

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King Charles III and Queen Camilla disembark their plane at Joint Base Andrews, Maryland, on April 27, 2026, beginning their State Visit to the United States to celebrate the country’s 250th anniversary of independence.(Win McNamee/Getty Images)

Mendoza pointed toQueen Elizabeth II’s past interventions as evidence that the monarchy can sometimes succeed where elected leaders cannot.

He cited Elizabeth’s historic role in easing tensions withIrelandand described royal diplomacy as uniquely positioned to create trust at the personal level.

“People often wonder why theBritish monarchystill exists in the 21st century,” Mendoza said.“This is why.”

Still, Mendoza was careful not to overstate the king’s role.

Charles, he said, is unlikely to directly influence specific policies on Iran,NATOor military cooperation.Instead, his greatest value lies in shaping what Mendoza called the “general mood music” around Trump’s willingness to engage.

“It’s more a question of general mood music, which could makethe president more receptiveto interesting solutions,” Mendoza said.

That distinction may prove crucial.

Rather than forcing policy alignment, Charles could help preservethe broader strategic atmosphereneeded to keep Washington and London functioning as close allies even while their elected governments disagree.

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Prince Charles and Camilla hosted President Donald Trump and first lady Melania Trump during a state visit in 2019.(Chris Jackson – WPA Pool/Getty Images)

For Britain, that may be particularly important as outside analysts warn that the “special relationship” is under mounting structural strain.

In an analysis published Monday, Council on Foreign Relations senior fellow Matthias Matthijs argued that while theroyal visit offers“spectacle and ritual,” it is unlikely to reverse what he described as the deeper unraveling of U.S.–U.K.ties.

Matthijs pointed to Trump’s repeated criticisms of Starmer about immigration, energy policy and Britain’s posture toward the U.S.-Israeli confrontation with Iran, suggesting Charles may now be doing much of the diplomatic “heavy lifting” required topreserve British access to Trump.

Meanwhile, constitutional scholars in Britain have also raised concerns.

Writing for the U.K.Constitutional LawAssociation earlier in April, Francesca Jackson warned that using the monarch as a diplomatic instrument during periods of sharp political volatility could expose the Crown to political backlash or “potential embarrassment,” especially if Charles is perceived as caught between Trump and Starmer.

That risk reflects the broader stakes.

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King Charles III and President Donald Trump inspect the Guard of Honour during the state visit at Windsor Castle in Windsor, England, Sept.17, 2025.(Anna Moneymaker/Getty Images)

If Trump embraces Charles while continuing to criticize Starmer, the visit could preserve royal rapport while underscoring political dysfunction, effectively creating a parallel diplomatic lane betweenWashington and the British Crown.

But for now, Mendoza argues, the monarchy’s purpose is not governance, but access to the king, which may still have a chance to keep the relationship from fracturing beyond repair.

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