Donald Trump has launched another attack on Keir Starmer as it emerged the UK will not be involved in his plan to blockade the Strait of Hormuz.

The US president announced on Sunday that America and “other countries” will stop ships coming in and out of the vital waterway.

Around one-fifth of the world’s oil and liquid gas supply usually passes through the key shipping lane.

But it has been effectively closed since the start of the war, with Iran targeting tankers which try to sail through it unless they agree to pay a toll.