Boris Johnson and US President Donald Trump have agreed to work together and address Iran’s “destabilising behaviour” in the Gulf.
Downing Street confirmed the two leaders spoke over the phone on Friday.
It comes as the new Foreign Secretary Dominic Raab discussed “key global priorities” such as Iran and NATO with US Secretary of State Mike Pompeo on Wednesday.
Tensions with Iran have escalated over the past month, including an incident where a British-flagged tanker was seized by Iranian forces.
In response, the Ministry of Defence announced the Royal Navy will escort British ships travelling through the Strait of Hormuz.
In the phone call, President Trump also congratulated the new prime minister on his appointment and agreed to meet at next month’s G7 summit, according to a statement from Number 10.
Downing Street also said the “important” UK-US relationship was discussed and how Brexit offers an “unparalleled opportunity” to strengthen economic ties between the two nations.
The statement added the two leaders are hoping to deliver an “ambitious free trade agreement”.
Speaking after the phone call, President Trump told reporters: “We’re working already on a trade agreement.
“I think it’ll be a very substantial trade agreement, you know we can do with the UK, we can do three to four times, we were actually impeded by their relationship with the European Union.
We were very much impeded on trade. And I think we can do three to four or five times what we’re doing.”
Prior to Mr Johnson’s appointment as prime minister, President Trump said he was confident Mr Johnson would “work out Brexit”.
The former foreign secretary vowed that Brexit will happen – “do or die” – before 31 October.
Mr Johnson’s arrival at Number 10 has seen major cabinet changes, including the sacking of Penny Mordaunt as Defence Secretary
Natalia Veselnitskaya – official website