After allies refused to send naval support in the Strait of Hormuz, the US president said his country does not need Nato. The stance left him increasingly isolated, while his counterterrorism chief resigned, saying Iran posed no imminent threat and questioning the strategy.

Germany and the UK have declined a US request to deploy naval vessels to the Strait of Hormuz, saying it falls outside Nato’s remit. The PM said Britain will not be drawn into a wider confrontation. The US president voiced frustration as partners resist patrols of the vital oil route.

UK troops in Iraq were targeted, prompting the defence secretary to consider deploying warships to secure the Strait of Hormuz and protect oil shipping. Tehran says it will maintain a blockade, squeezing supply and pushing energy costs higher in Britain.

Newly released papers say the PM was warned of reputational risk before appointing Peter Mandelson as ambassador to the US, citing his links to a disgraced financier already convicted of offences. They add he sought a £500,000 payout after dismissal and was paid £75,000.