The UN High Commissioner on Human Rights, Prince Zeid bin Ra'ad, has said Donald Trump will be "dangerous, from an international point of view" if elected as US president.

Prince Zeid cited Trump's views on vulnerable communities and his talk of using torture - banned under international law - as "deeply unsettling and disturbing".

"If Donald Trump is elected on the basis of what he has said already - and unless that changes - I think it is without a doubt that he would be dangerous from an international point of view", he said.