Hillary Clinton offers 'steady leadership'

Hillary Clinton has cast herself as a unifier for divided times, an experienced leader steeled for a volatile world - and aggressively challenged Donald Trump’s ability to do the same.

"Imagine him in the Oval Office facing a real crisis," the former US secretary of state and first lady said, as she accepted the Democratic nomination for president early on Friday.

"A man you can bait with a tweet is not a man we can trust with nuclear weapons."