United States President Donald Trump has posted on social media that he does not need the United Kingdom to deploy aircraft carriers to the Middle East, amid the ongoing war with Iran.

Saturday’s post on Truth Social follows a statement from the UK’s Ministry of Defence that one of its two flagship aircraft carriers, the HMS Prince of Wales, has been placed on “high readiness”.

“The United Kingdom, our once Great Ally, maybe the Greatest of them all, is finally giving serious thought to sending two aircraft carriers to the Middle East,” Trump wrote.

“That’s OK, Prime Minister Starmer, we don’t need them any longer — But we will remember. We don’t need people that join Wars after we’ve already won!”

The post, with its reference to the UK as a “once great ally”, signals a deepening rift between the two countries that has emerged since Trump returned to office last year.

The divide appears to have deepened over the past week, as the US and Israel continue to hammer Iran as part of a war they launched on February 28.

The conflict has sparked fears across the Middle East, as retaliatory strikes from Tehran target US allies across the region.

Already, an estimated 1,332 people have been killed in Iran, and the US has confirmed the deaths of six of its service members. More deaths have been reported in countries like Lebanon, Kuwait, the United Arab Emirates and Iraq.

The UK government has increased its involvement in the war on Iran, widely considered illegal under international law.

The UK Defence Ministry, for instance, said on Saturday that the government of Prime Minister Keir Starmer had allowed the US to use its military bases for what it termed “limited defensive purposes”.

The bases include RAF Fairford in Gloucestershire and tbe Diego Garcia site in the Chagos Islands, located in the Indian Ocean. Initially, there had been reports that Starmer had blocked the US use of the bases.

In the immediate aftermath of the initial US-Israeli strike, Starmer appeared to blanche at the prospect of joining the war.

He and the leaders of France and Germany issued a joint statement, underscoring that any actions they might take would be defensive in nature.

“We will take steps to defend our interests and those of our allies in the region, potentially through enabling necessary and proportionate defensive action to destroy Iran’s capability to fire missiles and drones at their source,” the joint statement said.

“We have agreed to work together with the US and allies in the region on this matter.”

But Starmer has had to push back on domestic criticism both for and against joining the war.

On Monday, he told the UK Parliament, “We are not joining the US and Israeli offensive strikes”, citing the need to protect “Britain’s national interest” and “British lives”.

The war in Iran remains largely unpopular in the UK. The polling firm Survation conducted a survey over the last week of 1,045 British adults, and it found that 43 percent of respondents called the war not justifiable.

When asked if they supported Starmer’s initial decision not to allow the US to use British bases, 56 percent of respondents approved. Only 27 percent said it was the wrong choice.

Thousands of protesters gathered outside the US embassy in London on Saturday to call for an end to the ballooning conflict.

But Trump has upped his criticism of Starmer over the past week, further fraying relations with the UK government.

On March 3, for instance, he held an Oval Office meeting with German Chancellor Friedrich Merz where he said repeatedly he was “not happy with the UK”.

Of Starmer, Trump added, “This is not Winston Churchill that we’re dealing with.”

Trump has long admired Churchill and last year installed a bust of the wartime prime minister in the Oval Office, just as he had during his first term.

By contrast, the US president has issued a flood of criticism against Starmer, particularly for his 2024 decision to transfer control of the Chagos Islands to Mauritius.

The transfer comes after the International Court of Justice found the UK acted unlawfully in 1965 by separating the islands from Mauritius to create a separate colony.

The deal with Mauritius, however, allows the US and the UK to maintain a military base on Diego Garcia, part of the archipelago.

Trump has repeatedly slammed the transfer, however, writing on social media that “giving away extremely important land is an act of GREAT STUPIDITY”.

Tensions between the US and UK also rose in January after Trump told Fox News that NATO allies had “stayed a little off the frontlines” during the US war in Afghanistan.

Starmer responded that he found Trump’s comments “to be insulting and frankly appalling”.

The Trump administration, however, has signalled it is pivoting away from its traditional European allies in favour of more politically aligned countries.

At a summit on Saturday with right-wing Latin American leaders, US Secretary of State Marco Rubio appeared to praise the attendees while casting shade on other allies.

“At a time when we have learned that oftentimes an ally, when you need them, maybe may not be there for you, these are countries that have been there for us,” Rubio told the summit.