Former Chicago Mayor Rahm Emanuel (D) said Sunday that although Sen. 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 (I-Vt.) is “the frontrunner” in the 2020 Democratic presidential race, he is “stoppable.”

Emanuel told ABC’s “This Week” that the Vermont progressive could falter if moderate voters “coalesce” around a candidate, instead of spreading their votes among former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE, former New York City Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE, former South Bend, Ind. Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE and Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.).

“But I would say this, the moderates need to coalesce around one person,” he said. “If you have a divided field, we’ve seen this play out in the Republican primary in 2016, if there is not kind of a singular mano to mano, then he’s gonna get the delegate primary.”

Rahm Emanuel says that Bernie Sanders is now the “frontrunner,” but “he is stoppable,” although for Sanders not to win the nomination, moderate Democrats would “have to coalesce under one person.” https://t.co/nfhvxYle4Z pic.twitter.com/lCXL0RBMLj — This Week (@ThisWeekABC) February 23, 2020

ABC host George Stephanopoulos George Robert StephanopoulosThe Memo: Media accused of using kid-gloves on Biden Trump ABC town hall pulls in fewer viewers than 'America's Got Talent,' NBA, Fox News The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE pointed out that “there’s no indication” any of these centrist candidates will drop out soon.

Emanuel, who served as former President Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE's White House chief of staff, responded, saying every candidate “still has a thread of a logic of why they should stay.”

“And as long as that happens, he will continue to have 45 percent,” the former mayor said, referring to Sanders.

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He also called attention to Sanders’s strategy, saying it “upends every electoral map” used by Democrats in the past couple of decades.

“It’s a different theory of the case never been tested before nationally and never been proven successful for any Democrat, either presidential or congressional majority,” he added.

Sanders has had a successful start to the primary season, grabbing wins in Nevada and New Hampshire and second place in Iowa. The senator currently retains 31 delegates, although 26 delegates have yet not been distributed after the Nevada caucuses Saturday.

The moderate candidates have been awarded a combined 35 delegates.