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In a post on TruthSocial, he says: "We no longer 'need,' or desire, the Nato countries' assistance — WE NEVER DID!"
Earlier, a top counterterrorism official resigned over the ongoing conflict, saying "Iran posed no imminent threat to our nation"
Meanwhile, Israel's defence minister says its military has killed Iran's security chief Ali Larijani in a strike - read more about him
Larijani was last seen in public at a Quds Day march in Tehran on Friday. Iran has not confirmed whether he has been killed or injured
One Iranian tells BBC Persian the war is "really destroying my nerves", while Tehran's Ministry of Intelligence says it has confiscated "hundreds of Starlink devices", which are used by some Iranians to access the internet
Asked next whether he has a "day after" plan for Iran, Trump says if they left now it would take "10 years for them to rebuild".
"But we're not ready to leave yet. But we will be leaving in the near future, we'll be leaving in pretty much the very near future," Trump says.
He repeats his point that the US has had "great support" from other countries in the Middle East but "essential no support" from Nato.
On his relationship with Starmer, Trump says he hasn't been supportive - he says the prime minister was willing to send two aircraft carriers "after we won" when there was no threat for them.
"I think he's a nice man but I'm disappointed," the president concludes.
Irish Prime Minister Micheál Martin steps in to say the transatlantic relationship between Europe and US is still "very important".
He says to Trump that Starmer is an "earnest" person that the president has the capacity to get on with.
President Trump is asked about the resignation of Joe Kent, his director of national counterterrorism, who said he couldn't remain in his job because he cannot support the conflict in Iran.
"I read his statement," says Trump. "I always thought he was a nice guy but I always thought he was weak on security, very weak on security."
He continues: "I didn't know him well ... But when I read his statement I realised that it's a good thing that he's out, because he said Iran was not a threat."Iran was a threat, every country realised what a threat Iran was."
Trump responds to a question about getting America's allies to help with escorting oil tankers through the Strait of Hormuz.
"Well we don't need any help," Trump begins, saying Nato allies had been in favour of what the US did - saying it was very important that they take out the nuclear threat from Iran.
The US has done that "very strongly", he says, adding that they have wiped out Iran's military, navy and air force.
On Nato - Trump says they are making "a foolish mistake".
"We don't need them but they should've been there."
Asked a follow up question on Macron's comments that France won't join a taskforce in Hormuz until the hostilities finish, Trump says he will be out of office soon.
More now from Trump, who says in a lengthy post on Truth Social that "most" Nato allies have said "they don’t want to get involved with our Military Operation" against Iran.
Trump says he is "not surprised by their action" and that he has always considered Nato "to be a one-way street".
He says: "Because of the fact that we have had such Military Success, we no longer 'need,' or desire, the NATO Countries’ assistance — WE NEVER DID! Likewise, Japan, Australia, or South Korea.
"In fact, speaking as President of the United States of America, by far the Most Powerful Country Anywhere in the World, WE DO NOT NEED THE HELP OF ANYONE!"
The post comes after Trump requested the help of Nato allies to help reopen the Strait of Hormuz - which he does not specifically mention in his post.