In this May 17, 2016 file photo, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at a rally in Carson, Calif. After months when the story of the 2016 presidential campaign focused on divided Republicans, Democrats are now showcasing divisions in their ranks. AP FILE PHOTO
WASHINGTON 鈥� The awkward embrace between Bernie Sanders and the Democratic Party may be nearing a breaking point.
Leading Democrats are growing increasingly vocal in their concerns about the White House hopeful鈥檚 continued candidacy, and if he and his legions of enthusiastic supporters ultimately will unite behind Hillary Clinton in a general election against Donald Trump.
For his part, Sanders has sharpened his critique of the party. He says it would be 鈥渟ad and tragic鈥� if Democrats don鈥檛 stop relying on big money, and he is assailing Clinton for her dependence on wealthy donors. Clinton backers grumble that such comments can only help Republicans, belying Sanders鈥� claims that he鈥檒l work tirelessly to ensure Trump doesn鈥檛 end up the president.
The tone on both sides is worsening after last weekend鈥檚 fracas at the Nevada Democratic Convention. Furious over rules they claimed favored Clinton, a group of Sanders supporters shouted obscenities, brandished chairs and threatened and harassed the party chairwoman. And after Democratic officials including Senate Minority Leader Harry Reid of Nevada pressed Sanders to denounce the events, Sanders defiantly asserted that his supporters were treated unfairly.
The tenor of the Sanders鈥� statement disturbed Democratic leaders. They鈥檙e worried that as the primary process nears its end, Sanders may resist the graceful exit that Democrats expect of him and instead heed advisers and supporters pressing him to maintain the fight, perhaps all the way to the Democratic convention in Philadelphia in July.
鈥淓verything our families care about is at stake here,鈥� said Democratic Sen. Barbara Boxer of California, who said she feared for her safety after being booed and shouted down at the Nevada convention.
Boxer said in an interview that she spoke with Sanders this week, and found her Vermont colleague very upset, insisting 鈥渕y people wouldn鈥檛 do this.鈥�
鈥淚 just told him, 鈥楤ernie, you need to take control of this,'鈥� Boxer said.
Boxer and other influential Democrats cited Clinton鈥檚 handling of her bitter loss to Barack Obama eight years ago as a model. Then, Clinton washed away a season of bad blood by conceding and throwing her support behind the eventual president.
鈥淭he math didn鈥檛 add up for her then and it doesn鈥檛 add up for Bernie now,鈥� Democratic Sen. Debbie Stabenow of Michigan said.
Vice President Joe Biden gently chastised Sanders, saying he should be more aggressive in speaking out if his supporters behave as badly as they did in Nevada, but expressing confidence the party would unify. 鈥淚鈥檓 not worried. There鈥檚 no fundamental split in the Democratic Party,鈥� he said in Ohio Wednesday.
Few are demanding publicly that Sanders get out of the race immediately. That may change quickly if he doesn鈥檛 do so early next month, presuming Clinton wraps up the nomination as expected. But right now, the party鈥檚 leaders want to avoid making the campaign so bitter that Sanders鈥� backers refuse to rejoin the fold.
Looming over all the uncertainty is the prospect of violence in Philadelphia like the riots that marred the 1968 convention in Chicago.
鈥淧eople are trying to reach out and make sure that this thing doesn鈥檛 get ruptured,鈥� Sen. Claire McCaskill, D-Mo., said. The question, she said, is will Sanders 鈥済o all-in to help Hillary Clinton defeat Donald Trump?鈥�
Jim Manley, a Democratic spokesman and former top Reid aide, worried that even if Sanders backs Clinton, the rancor of the campaign may lead his supporters to stay home on Election Day.
But a bitter end to the Clinton-Sanders primary may be difficult to avoid.
Sanders has won 20 states. And his ability to energize progressives and draw huge crowds has contrasted with Clinton鈥檚 plodding air of inevitability that has excited few people on her march to the Democratic nomination. Sanders and his advisers can claim to have sparked a movement. Clinton has been more workmanlike in piling up delegates, even if her supporters note that she generated enough energy to swamp Sanders in major states like New York.
READ: Clinton, Sanders too close to call in Kentucky primary
For months, Democrats welcomed the vigor of Sanders鈥� campaign. Now they want to be sure he鈥檒l transfer that energy to Clinton鈥檚 campaign.
Reid and Sanders have discussed Sanders鈥� Senate future and advancing the 74-year-old, democratic socialist鈥檚 progressive ideals. They鈥檝e also spoken about campaigning for Senate Democrats and likeminded candidates like Wisconsin鈥檚 Russ Feingold, who said Wednesday there is no hurry for Sanders to quit.
鈥淲e鈥檒l get it all together in July,鈥� Feingold said.
Sanders hasn鈥檛 made his intentions clear.
On the campaign trail, he routinely criticizes Trump. Yet Sanders鈥� public statements sometimes suggest Clinton wouldn鈥檛 be a worthy option for his supporters.
In California on Tuesday, Sanders said Democrats must choose between welcoming voters 鈥渨ho are prepared to fight for real economic and social change,鈥� or opting to maintain a structure 鈥渄ependent on big money campaign contributions and be a party with limited participation and limited energy.鈥�
But senior adviser Ted Devine brushed aside concerns about Sanders鈥� loyalty to the Democratic cause. 鈥淗e intends to support the nominee of the party even if it is not him,鈥� Devine said.
READ: Clinton, Sanders vigorously challenge each other鈥檚 judgment