"This man is unfit to be President of the United States of America. I never questioned another man's motive where I look at when he says and what he does. That's what he says and what he does," Biden said at an election rally in Las Vegas for Democratic presidential nominee Hillary Clinton.
"This is a man who is devoid of any substance of knowledge about America's security," he added.
"This man is either totally devoid of any knowledge or -- I really mean it now. I really mean it. This is deadly earnest stuff, because he is undermining American security already. This is a guy who says that, 'You know it is not bad that Japan and Saudi Arabia get nuclear weapons, that is a good idea'," he said.
"This is a guy who says, 'We ban all Muslims from the United States.' That is the real way of keeping cooperation going in the rest of the world, isn't it?
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"I have spent my whole career trying to change the culture. And here the presidential candidate says, 'Because he is famous and powerful, he can grope any women he wants,' and, quote, 'They let him do it.' That is a textbook definition of sexual assault," he said.
"You don't have to make anything up when it comes to Donald Trump. You know it's - he is the least qualified nominee of either political party in the history of the United States of America," he said.
"This guy, he praises (Russian President Vladimir) Putin all throughout Europe and the world talking about him being a strong leader, as he, Putin, uses his intelligence community to hack into cyberspace here in the United States. This is a guy who didn't even know that Crimea was part of Ukraine - it's a part of Ukraine that's already occupied," he said.
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