Donald Trump warns he may not have 'a very good relationship' with Cameron, says 'ignorant' Sadiq Khan should take an IQ test and tells British voters: 'What do you need the EU for?'

Donald Trump, main image left with Piers Morgan, has admitted he will be unlikely to have a 'very good relationship' with David Cameron, inset left, for calling him 'stupid' for proposing to ban Muslims from the US. The Republican presidential front runner also branded new London Mayor Sadiq Khan, inset right, 'ignorant' for comments he made after being elected and said he should take an IQ test. The billionaire also warned him: 'I will remember those statements.' And he also weighed in to the EU referendum battle and said the UK should leave because: 'what do you need it for?'