The US president said he was ‘really disappointed’ with allies and singled out Sir Keir Starmer for criticism.
Donald Trump has taken a further sideswipe at the UK for refusing to be drawn into the Iran conflict.
The US president renewed his criticism of Prime Minister Sir Keir Starmer as he pointed out countries now wanted to be involved in reopening the Strait of Hormuz but “not while the war was going on”.
He made his comments after saying the US did not need Britain and other European allies to send minesweepers to the waterway, but if they did it would be “good”.
Leaders at the G7 summit backed the UK-French-led effort to enable shipping to pass safely through the critical Gulf waterway once hostilities with Iran ended.
The proposed defensive mission includes the deployment of autonomous mine-hunting equipment.
An interim peace deal to end the nearly four-month-long war between the US and Iran, along with Ukraine, topped the agenda at this week’s meeting of heads from the G7 group of leading democracies in Evian, France.
Asked at a news conference about the need for the help of other countries, he said: “We don’t need it.
“Oh, by the way, they all want to do it. They all want to do it, every single one of them.
“They want to go be a part of it now, not while the war was going on.
“I was really disappointed.
“The UK, I said ‘it’d be nice’, I didn’t put a hard sell on, but I said ‘it’d be nice if you sent some ships’, and the Prime Minister said ‘they’ll be there, sir, as soon as the war is over’.
“I said, ‘Did you say that?’ I couldn’t believe it, actually.”
Mr Trump also criticised Japan for not being willing to be drawn into the war.
He said: “Nobody did, we did it ourselves with Israel and with the Arab states that got hit, surprisingly.”
Earlier, speaking during talks with India’s Prime Minister Narendra Modi, Mr Trump was asked whether he wanted European allies to send minesweepers to the strait.
Responding, the president said: “We don’t need them but if they want to send them, I think it’s good.”
Pressed over which nations would be contributing, Mr Trump said: “The ones that have that kind of equipment, but every one of them have committed to being involved.”
At the summit, Sir Keir and his counterparts welcomed Mr Trump’s “breakthrough” agreement with Tehran, but underlined the need for a “robust and comprehensive” follow-up accord “that can bring peace and security for all in the region”.
As part of this, they highlighted further negotiation was required to ensure Iran can “never obtain a nuclear weapon”.
The US-Iran agreement will be formally signed in Switzerland on Friday.
As well as reopening the Strait of Hormuz, it is widely reported the deal will allow Iran to start selling its oil without restrictions.
It also holds out the prospect of providing at least 300 billion US dollars (£223 billion) to Iran to rebuild after the war, although it is understood this would be subject to a final agreement being concluded on its nuclear programme, as would the lifting of sanctions and the release of assets frozen abroad.
Mr Trump has said the US was “not putting up 10 cents” for the fund and it remains unclear how it would be bankrolled.
The move to allow Iran to sell its oil freely immediately, and the offer to eventually lift all sanctions, represent major concessions that go beyond the terms of Iran’s 2015 nuclear deal with world powers, which Mr Trump unilaterally withdrew the US from in his first term, branding it the “worst deal ever”.
In the interim deal, Iran reiterates it will never produce nuclear weapons – a promise it also made in the 2015 accord.
The new pact is likely to face criticism in Washington and appears to be a major setback for Israeli Prime Minister Benjamin Netanyahu, who launched the military offensive with Mr Trump on February 28.
The deal calls for an immediate end to all fighting in Lebanon between Israel and the Iranian-backed Hezbollah militant group.
