Donald Trump today insisted he is "not a divisive" person as he took aim at the British prime minister and new mayor of London.

Trump's plan to stop all Muslims entering the United States was famously branded "stupid, divisive and wrong" by David Cameron earlier this year.

But on Monday morning, the Republican presidential hopeful used an interview with ITV’s Good Morning Britain to hit back with some vigour:

"Well, number one I'm not stupid, Okay. I can tell you that, right now - just the opposite.

"Number two, in terms of divisive: I don't think I'm a divisive person. I'm a unifier, unlike our president now, I'm a unifier."

The tycoon then suggested he wanted the prime minister to row back on his comments or apologise.

"It looks like we're not going to have a very good relationship. Who knows! I hope to have a good relationship with him but it sounds like he's not willing to address the problem either."

Trump also had a go at Sadiq Khan for calling him "ignorant". After interviewer Piers Morgan raised Khan’s comments, Trump showed just how thick-skinned he isn't .

"Let’s do an IQ test," he said.

Responding to this later, Khan’s spokesperson said: "Ignorance is not the same thing as lack of intelligence."

Also in this morning’s interview, Trump said: "He doesn't know me, hasn't met me, doesn't know what I'm all about. I think they were very rude statements and frankly tell him I will remember those statements. They are very nasty statements."

"Tell him I will remember those statements. They're very nasty statements….I just think it's very rude of him. In fact it's the opposite. I wished him well when I heard he won."

Commenting on the interview, a spokesperson for Khan made it clear that the new mayor is in no mood to back down.

The spokesperson said: "Donald Trump’s views are ignorant, divisive and dangerous. It’s the politics of fear at its worse. It plays straight into the extremists’ hands and makes both our countries less safe."

You can watch the interview here.