Clinton campaign fends off questions about WikiLeaks 'speech excerpts'

• Kaine doubts accuracy of 'documents dumped by hacking organization'
• Giuliani leads Republican attack: 'We have a person who is a liar'

Leaders of Hillary Clinton's campaign were forced on the defensive on Sunday, over apparent leaks from paid speeches the Democratic presidential nominee made to top bankers, whom she said she had fought for as a senator for New York and whose role after the 2008 financial crisis she said was misunderstood.

Related: Donald Trump groping remarks reveal 'pattern of sexual assault', says Kaine