Independent Sen. Bernie Sanders of Vermont was booed by many of his own delegates on July 25 after he called on them to vote for presumptive Democratic presidential nominee Hillary Clinton in Philadelphia (video below).
Sanders, who is in town for the Democratic National Convention, was speaking to about 1,900 of his delegates when they booed him, reports USA TODAY.
"Immediately, right now, we have got to defeat Donald Trump and we have got to elect Hillary Clinton and Tim Kaine," Sanders said.
After the jeers erupted, Sanders tried to calm his delegates.
"Brothers and sisters, this is the real world that we live in," Sanders added. "Trump is a bully and a demagogue. Trump has made bigotry and hatred the cornerstone of his campaign."
According to ABC News, Jane Sanders told her husband after his speech: "They don't know your name isn't being put in nomination," although other reports quoted her as saying "is."
Sanders campaign spokesman Michael Briggs said that she was referring to a roll call vote on July 26 when Sanders' delegates will be able to vote for him.
Some of Sanders' supporters told ABC News and USA TODAY that they would vote for Clinton, but others affirmed they would be voting for a third-party candidate, which is a de facto vote for Trump.
Jeff Weaver, Sanders' campaign manager, was asked by The Hill on July 25 if Sanders supporters should stop shouting, "Lock her up!" which has been a familiar refrain at Trump rallies and at the Republican Presidential Convention (RNC) last week.
"Yes," Weaver said.
"I would encourage them to continue the political revolution by advancing the cause of progressive change," Weaver added. "And the best way we're going to do that at this point is to elect Democrats up and down the ballot."
There were reportedly "Hillary for Prison" signs (another prominent feature at the RNC) at a protest march by Sanders supporters on July 24.
"I know emotions are running high right now, but I think people really have to consider the implications of what a [Donald] Trump presidency would mean for those of us who support the kind of agenda that Bernie Sanders has laid out for the country," Weaver told The Hill.