Hillary Clinton: Donald Trump is 'dangerously incoherent'

  

Hillary Clinton has called Republican presumptive nominee Donald Trump "dangerously incoherent".

The Democratic front-runner said Mr Trump was unfit to be president and his election would be a "historic mistake".

Mr Trump hit back, saying Mrs Clinton "no longer has credibility - too much failure in office".

Outside Mr Trump's rally in San Jose, California, anti-Trump protesters clashed with his supporters in one of the worst such confrontations so far.

Several Trump supporters were punched, one was pelted with eggs and others were spat at, reports said.