Donald Trump has claimed he 'saved' Britain from a nuclear attack by launching strikes on Iran, as he renewed his criticism of the UK for refusing to join the conflict. The US President also described the UK as reaching 'tipping point' and made a fresh attack on London, saying that immigration had created 'no go' zones in the city. In doing so, Mr Trump reignited his long-running feud with London Mayor Sir Sadiq Khan during the TV interview on Thursday, dismissing him as a 'nasty guy'.But a source close to the Labour mayor hit back, saying Mr Trump 'just can't comprehend our success'.Justifying the war, the US leader said: 'I'm saving your country from the threat too.'Because if Iran had a nuclear weapon, they're more likely to use it in Europe, where they do have missile capability, than they are in America, where they don't.''I'm saving your country from a problem because they would use it.'Mr Trump made the remarks as tensions between Washington and Tehran remain at boiling point over the strategically vital Strait of Hormuz in the Middle East. US President Donald Trump spoke at a dinner he hosted in the Rose Garden at the White House on Wednesday Smoke rises from the site of an Israeli airstrike that targeted the nearby area of al-Mansouri in Lebanon on Wednesday A drone view shoes vessels stranded near the Strait of Hormuz in AugustThe vital oil and gas shipping route stayed open before the US and Israeli offensive against Iran, which was aimed at preventing the country from developing a nuclear weapon. The disruption in the Gulf channel has sent shock waves across the world's economies, including the UK's, and caused a spike in petrol prices.The US President again dug into Britain's reluctance under former prime minister Sir Keir Starmer to be drawn into the Iran conflict. During Sir Keir's premiership, the UK initially refused to take part in the US-Israeli offensive against Iran.Sir Keir later authorised forces to support 'defensive' strikes against targets such as missile launchers.However, the UK did not agree to Mr Trump's call to send the Navy to reopen the Strait of Hormuz. A fifth of global oil and gas supplies typically pass through the waterway, but Iran blockaded it in response to the attacks.A furious Mr Trump branded Sir Keir 'no Churchill' and insisted he had refused a British offer to send an aircraft carrier to the region because it came too late. Ministers denied such an offer had been made.Speaking to GB News, the US President said: 'Don't forget, you get a big percentage of your oil from the Strait of Hormuz, and you weren't there to help me.' London Mayor Sadiq Khan attended the 'Let's Do London' US tourism campaign in Times Square in May 2022