Donald Trump says UK politicians should be thanking him for "saying what needed to be said" about radicalisation in parts of London.
The Republican presidential candidate claimed parts of the city were "so radicalised" the police force were "afraid for their own lives".
In a statement to the Daily Telegraph, he said: "The UK politicians should be thanking me instead of pandering to political correctness.
"In fact, in an article out today, many police officers in London have come forward to confirm their fears of terrorism.
"I only said what needed to be said, and when I am elected no one will be tougher or smarter than me. I will work very hard and effectively to defeat terrorism."
He insisted he had already done a lot for the UK - citing his controversial golf course development in Aberdeenshire.
Prime Minister David Cameron has condemned his remarks as "divisive" and "wrong".
Mayor of London Boris Johnson went further, saying: "When Donald Trump says there are parts of London that are no-go areas, I think he is betraying a quite stupefying ignorance that makes him frankly unfit to hold the office of the president of the United States."
He said Mr Trump was "clearly out of his mind" if he thought the idea was sensible."What he's doing is playing the game of the terrorists and those who seek to divide us. That is exactly the kind of reaction they hope to produce," he added.
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