Republican presidential hopeful Donald Trump's "cynicism is unbounded", US Vice-President Joe Biden has said.
Speaking at the Democratic National Convention, Mr Biden launched a scathing attack on the billionaire tycoon, accusing of him of being inconsiderate and out of touch with ordinary Americans.
"His lack of empathy and compassion can be summed up in a phrase I suspect he's most proud of having made famous: "You're fired."
"How can there be pleasure in saying you're fired? He's trying to tell us he cares about the middle class - give me a break.
"That's a bunch of malarkey. He has no clue about what makes America great. Actually he has no clue period."
In contrast, the vice-president sought to recast the image of Mrs Clinton as a remote establishment figure by maintaining that she could relate to the problems of ordinary citizens.
Hillary understood that for years, millions of people went to bed staring at the ceiling, thinking 'oh my god, what if I get breast cancer or he has a heart attack, I will lose everything, what will we do then?'
Khizr Khan got huge cheers as he challenged Donald Trump to "read the US constitution" and accused him of "sacrificing nothing" for America.
Clinton needs to win over doubters all over the USA. We joined a family of sceptical and divided voters to see if her message hit home.
The historic Democrat nominee's key message sought to resonate with her opponents as well as her supporters. But it also raised questions.