Democratic presidential candidate Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE closed out a long day of nasty fights with party leaders by warning that it risks losing his supporters if they continue to feel shunned.

Speaking at a rally in Southern California after splitting primary contests with rival Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE in Oregon and Kentucky, Sanders declined to weigh in on the nasty rift that has opened between him and Democratic leaders over an outbreak of protests at the Nevada convention over the weekend.

Instead, Sanders warned that they risk losing the presidential election to presumptive Republican nominee Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE if they don’t make room for his supporters.

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“Let me also say a word to the leadership of the Democratic Party,” Sanders said. “And that is that the Democratic Party is going to have to make a very profound and important decision. It can do the right thing and open its doors and welcome into the party people who are prepared to fight for real economic and social change. That is the Democratic Party I want to see.”

“I say to the leadership to the Democratic Party — open the doors, let the people in!” Sanders declared. “Or the other option for the Democratic Party, which is a sad and tragic option, is to choose to maintain its status quo structure.”

The remarks came at the end of a long day that found Sanders and his campaign in a nasty public fight with Democratic National Committee Chairwoman Debbie Wasserman Schultz, Senate Democratic leader Harry Reid Harry Mason ReidGraham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' Senate Republicans signal openness to working with Biden MORE (Nev.) and the Nevada State Democratic Party.

Party leaders are furious with Sanders and his supporters after chaos erupted at the Nevada state convention over the weekend.

Sanders supporters believe party leaders moved to block their efforts to win their candidate a few extra delegates.

They protested on the floor of the convention, and the chairwoman of the state party now says she’s getting threatening voicemails from Sanders supporters.

Sanders and his campaign say they did not provoke the protests and condemned the threats.

But they said the state party brought it upon itself by circumventing normal order to help Clinton grow her delegates lead.

Wasserman Schultz in particular was furious with Sanders’s reaction to the controversy.

“Unfortunately, the senator’s response was anything but acceptable,” she said on CNN. “It certainly did not condemn his supporters for acting violently or engaging in intimidation tactics and added more fuel to the fire.”

But Sanders is showing no signs of backing down.

While the delegate math is tilted strongly against him, he vowed to take the nominating fight all the way to the Democratic National Convention in Philadelphia in July.

“Before we will have the opportunity to defeat Donald Trump, we’re going to have to defeat Secretary Clinton,” Sanders said.

“Now some people say we’ve got a steep hill to climb and that’s absolutely true,” he continued. “But together we’ve been climbing that steep hill from day one in this campaign, and we’ll continue to fight for every last vote until June 14, and then we’ll take our fight into the convention.”