Donald Trump has reignited his row with London mayor Sir Sadiq Khan after calling him a “nasty person” who has done “a terrible job”.

During an hour-long news conference with Sir Keir Starmer in Scotland, the US president hit out at the Labour mayor, who has responded with his own snipey remarks.

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Asked if he would visit London during his state visit in September, Mr Trump said: “I will, I’m not a fan of your mayor, I think he’s done a terrible job.

“A nasty person, I think.”

The prime minister then interrupted and said: “He’s a friend of mine.”

But the president added: “I think he’s done a terrible job but I will certainly visit London, I hope so.”

Sir Sadiq’s spokesperson then released a statement saying: “Sadiq is delighted that President Trump wants to come to the greatest city in the world.

“He’d see how our diversity makes us stronger not weaker; richer, not poorer.

“Perhaps these are the reasons why a record number of Americans have applied for British citizenship under his presidency.”

They noted that Sir Sadiq has won three mayoral elections, including when Mr Trump lost the US election in 2020.

This is not the first time Mr Trump and Sir Sadiq have locked horns.

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During his first presidential term, Mr Trump called the London mayor a “stone cold loser who should focus on crime in London”.

Sir Sadiq then described Mr Trump as a “poster boy for racists”.

And in November 2024, after Mr Trump won his second term, Sir Sadiq said many Londoners would be “fearful” about what it would “mean for democracy”.

However, as Sir Keir tried to show diplomacy with Mr Trump after becoming PM, Sir Sadiq said he “wanted to work closely with the American president” ahead of his inauguration in January.

The London mayor said as somebody “who believes in democracy, and voting and elections, we should recognise the fact that Donald Trump is the elected president of the United States”.

But he added: “Let’s keep our fingers crossed that this president is different from the last time he was president.”

When TV cameras are let in to film world leaders meeting in person, the resulting footage is usually incredibly boring for journalists and incredibly safe for politicians.

Not with Donald Trump.

Sir Keir Starmer ran the gauntlet on Monday.

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Put through a total of almost 90 minutes of televised questioning alongside the American leader, it was his diciest encounter with the president yet.

But he still just about emerged intact.

For a start, he can claim substantive policy wins after Trump announced extra pressure on Vladimir Putin to negotiate a ceasefire and dialled up the concern over the devastating scenes coming from Gaza.

There were awkward moments aplenty though.

Top of the list is Mr Trump’s trashing of the prime minister’s Labour colleague, London mayor Sir Sadiq Khan.

But more important than that, Monday’s meeting was the clearest representation of the political gulf that separates the two leaders.

“He’s slightly more liberal than me,” Mr Trump said of Sir Keir when he arrived in Scotland.

What an understatement.

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On green energy, immigration, taxation and online regulation, the differences were clear to see.

Sir Keir just about managed to paper over the cracks by chuckling at times, choosing his interventions carefully and always attempting to sound eminently reasonable.

At times, it had the energy of a man being forced to grin and bear inappropriate comments from his in-laws at an important family dinner.

But hey, it stopped a full Trump implosion – so I suppose that’s a win.

My main takeaway from this Scotland visit though is not so much the political gulf present between the two men, but the gulf in power.

Sir Keir flew the length of the country he leads to be the guest at the visiting president’s resort.

He was then forced to sit through more than an hour of uncontrolled, freewheeling questioning from a man most of his party and voters despise, during which he was offered unsolicited advice on how to beat Nigel Farage and criticised (albeit indirectly) on key planks of his government’s policy platform.

In return he got warm words about him (and his wife) and relatively incremental announcements on two foreign policy priorities.

So why does he do it?

Because, to borrow a quote from a popular American political TV series: “Air Force One is a big plane and it makes a hell of a noise when it lands on your head.”