Video report by Political Correspondent Carl Dinnen

Donald Trump has issued a warning to David Cameron that the two may not have a good relationship if Mr Trump becomes the next US president.

The US Republican presidential hopeful was responding to comments Mr Cameron made last year over Mr Trump's proposal to ban Muslims from entering the US.

The prime minister called the idea "divisive, stupid and wrong" and his since refused to withdraw those comments.

In an interview with Piers Morgan for ITV's Good Morning Britain, Mr Trump dismissed the remarks, but issued a rebuke to the prime minister saying, "it looks like we're not going to have a very good relationship".

"I hope to have a good relationship with him, but it sounds like he's not willing to address the problem either," Mr Trump said.

When Mr Cameron made his comments in December last year the race for the Republican nomination was still relatively open.

Since then Mr Trump has emerged as all but certain to be the Republican contender for the presidency, facing off against Democrat Hillary Clinton.

Trump attacks 'ignorant' Khan

Mr Trump has also faced criticism from Sadiq Khan, the new mayor of London, who called Mr Trump's views on Islam "ignorant" and warned they could make "both our countries less safe".

Asked about the Mr Khan's comments in his Good Morning Britain interview, Mr Trump said he "didn't care" about the London mayor and thought his statements were "very rude".

"Tell him I will remember those statements," he said. "They're very nasty statements."

Responding to the attack, a spokesperson for Mr Khan condemned Trump's views as "ignorant, divisive and dangerous".

'Britain will not be at back of queue if it left EU'

Asked whether or not Britain should remain in the EU, Mr Trump questioned what the EU does for Britain, saying he thinks the EU has been a "disaster" and is "very bureaucratic and very difficult".

He added: "If I were from Britain, I would probably not want [the EU]".

When pressed over whether Britain would be front or back of the queue with regards to trade deals, as Barack Obama said last month, he rejected the notion entirely.

"You have to make your own deal," he said. "Britain's been a great ally. With me, they'll always be treated fantastically."

He declined to go into details about what exact priority Britain would have, and added: "It wouldn't make any difference to me whether they were in the EU or not.

"You would certainly not be back of the queue, that I can tell you."

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Responding to the attack, a spokesperson for Mr Khan condemned Trump's views as "ignorant, divisive and dangerous".

Donald Trump's views are ignorant, divisive and dangerous - it's the politics of fear at its worst and will be rejected at the ballot box just as it was in London. Sadiq Khan

A Number 10 spokesman said that Mr Cameron was "committed to maintaining the special relationship" whoever wins the presidential election.

George Osborne said he and David Cameron would speak with Donald Trump with the billionaire certain to be the Republican choice for president.

But he said he and David Cameron stood by their comments in response to Mr Trump's views on Muslims.