Donald Trump: 'I do regret' some caustic campaign statements

US billionaire Donald Trump has admitted for the first time that he regrets some of the caustic comments he has made during his presidential election campaign.

"Sometimes in the heat of debate and speaking on a multitude of issues, you don't choose the right words or you say the wrong thing. I have done that," the Republican nominee, reading from a prepared text, said at a rally in Charlotte, North Carolina, on Thursday night.