Senator Bernie Sanders has ended his US presidential campaign after disappointing primary results, leaving Joe Biden as the likely Democratic nominee.
The Vermont senator's announcement makes former vice president Mr Biden the presumptive Democratic nominee to challenge President Donald Trump in November.
Mr Sanders plans to talk to his supporters later on Wednesday.
Mr Sanders initially exceeded sky-high expectations about his ability to recreate the magic of his 2016 presidential bid, and even overcame a heart attack last October on the campaign trail.
But he found himself unable to convert unwavering support from progressives into a viable path to the nomination amid "electability" fears fuelled by questions about whether his democratic socialist ideology would be palatable to general election voters.
The 78-year-old senator began his latest White House bid facing questions about whether he could win back the supporters who chose him four years ago as an insurgent alternative to the party establishment's choice, Hillary Clinton.
Despite winning 22 states in 2016, there were no guarantees he would be a major presidential contender this cycle, especially as the race's oldest candidate.
Mr Sanders, though, used strong polling and solid fundraising — collected almost entirely from small donations made online — to more than quiet early doubters.