Targeting Republican presidential nominee Donald Trump over rejigging of his campaign for the second time in two months, his Democratic rival Hillary Clinton has said the move will not change his personality.

"I think it's fair to say that Donald Trump has shown us who he is, he can hire and fire anybody he wants from his campaign. They can make him read new words from a teleprompter," Clinton said at an election rally in Cleveland yesterday.

"But he is still the same man who insults Gold Star families, demeans women, mocks people with disabilities, and thinks he knows more about ISIS than our generals," she said amidst laughter from the audience.