We don't know yet what that plan is -
we know Trump wants significant support, including military support, but the logic of the PM's position suggests this is unlikely, writes Chris Mason
It comes after Trump said it would be "very bad for the future of Nato" if allies don't help secure the Strait of Hormuz, a key channel for global oil
In response, Nato says "allies have already stepped up to provide additional security in the Mediterranean"Earlier the Israeli military said it had begun "a wide-scale wave of strikes" in the cities of Tehran, Shiraz and Tabriz, with BBC Verify seeing videos of damage in Iran's capital
Qatar says it intercepted a second wave of missiles from Iran following an attack earlier, while in the UAE drone attacks caused fires at a large oil industrial area in Fujairah
Trump says the US has hit 7,000 targets and sunk more than 100 ships so far in the war.
"They have been literally obliterated," the president said, adding that the country's air force and navy is gone, their leaders are gone, and their anti-aircraft technology has been "decimated".
The US and Israel are "doing what should have been done many years ago", he says. He adds that the US has today struck three plants in Iran where drones and missiles were being manufactured.
He also referenced the US bombing of Kharg Island last week, saying they destroyed everything besides "the pipes" where they keep the oil. But the president made it clear he could change his mind, adding that destroying the oil would only take "minutes".
Trump has made brief remarks concerning the war in Iran at the top of his event, saying - as he often does - that Iran's military capacity has been "obliterated" and touting US and Israeli success in the campaign.
The US president has also pointed to what he said were significant reductions in the number of Iranian drones being launched at its neighbours, as well as ongoing targeting of manufacturing sites and naval targets.
Additionally, he has again called on other countries to "come and help us" with the Strait of Hormuz - an issue with enormous global economic impact as well as important domestic political considerations for the administration.
The US, Trump seems to be suggesting, will remember which countries came to the aid of the US in this conflict.
There has so far been very little new information in his remarks - he covered much of this with reporters travelling back with him from Florida last night.
Throughout his two terms in office, Donald Trump hasn't been shy to criticise – even to attack – Washington's Nato allies.
But his latest suggestion – that failing to secure the Strait of Hormuz would be "very bad for the future of Nato" – implies an understanding of the alliance's purpose that has already raised eyebrows.
"Nato was created as a …defensive alliance," Gen Nick Carter, former chief of the defence staff, told the BBC on Monday.
"It was not an alliance that was designed for one of the allies to go on a war of choice and then oblige everybody else to follow," he said.
Coming from a president who only two months ago was making strident claims to Greenland, the sovereign territory of a fellow Nato member, there's more than a little irony in his latest remarks.
This perhaps helps to explain why some responses have been fairly blunt.
In Germany, a government spokesman said the war with Iran "has nothing to do with Nato", while the country's Defence Minister Boris Pistorius seemed to pour scorn on the idea that Europe's modest navies could make a difference.
"This is not our war. We have not started it."
But none of this should hide the fact that there's now an urgent, and growing, need for a solution to the crisis in the Gulf. Iran's effective blocking of the Strait of Hormuz – except for a handful of vessels carrying its own oil to allies like India and China – has left western governments scrambling to find a solution.
It may be a crisis triggered by Donald Trump's decision to go to war, but it's one that needs to be fixed quickly, before the impacts on the global economy get any worse.