US Election 2016: Hillary Clinton 'secures Democratic nomination'
ITV News video report by Washington Correspondent Robert Moore
Hillary Clinton is on the brink of history after reportedly securing enough delegate support to win the Democratic nomination.
She will become the first female nominee for a major US political party, setting up a November showdown with the likely Republican candidate Donald Trump.
A tally by the Associated Press put Mrs Clinton on 2,383 - the number needed to make her the presumptive nominee.
She reached the landmark after winning a burst of last-minute support from superdelegates - party officials who do not formally vote until the Democratic convention in July.
The former secretary of state acknowledged the count at a rally in California, telling the crowd that "we are on the brink of a historic - historic, unprecedented moment".
But she said there was "still work to do".
Campaigning to be Barack Obama's successor, Mrs Clinton held off a surprisingly strong challenge from Vermont senator Bernie Sanders.
Sanders, 74, has refused to give up despite the figures and calls from his own party.
His team said he will work to change the minds of superdelegates ahead of the convention in July.
"Our job from now until the convention is to convince those superdelegates that Bernie is by far the strongest candidate against Donald Trump," said Sanders spokesman Michael Briggs.