Former Chicago Mayor Rahm Emanuel (D) said Tuesday that the Democratic Party is starting to “panic” amid the surging presidential campaign of Sen. Bernie SandersBernie SandersDrugmaker caps insulin costs at to help diabetes patients during pandemic The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic Sen. Brown endorses Biden for president MORE (I-Vt.).

“I would say ‘panic’ would be the apt adjective to describe the mood right now,” Emanuel, who also served as former President Obama's first chief of staff and as chairman of the Democratic Congressional Campaign Committee from 2005 to 2007, told CNN’s Christiane Amanpour.

“Since 1992 from Bill ClintonWilliam (Bill) Jefferson ClintonHistory's lessons for Donald Trump Clintons send pizza to NY hospital staff treating coronavirus Budowsky: President Trump, meet with all former living presidents MORE’s election and reelection, Barack ObamaBarack Hussein ObamaMore than 400,000 people barred from becoming citizens due to coronavirus: report Poll finds public evenly split on delayed Supreme Court ObamaCare decision Samantha Power: UN covering up Russia's role in Syria bombings MORE’s elections in ’08 and ’12 and the national midterm elections of 2006 and 2018, it’s been one playbook of what I call a metropolitan majority between suburban and urban coming together to give Democrats a majority,” he said.

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Emanuel went on to say that a presidential campaign that doesn't "govern and run in a center-left fashion, but only left” would replicate the Labour Party’s defeat in the U.K. in 2019.

“To me, it’s not a risk worth taking,” he said.

“I’m personally friendly with Sen. Sanders. I’m not a fan of the politics, I think it will lead to an electoral defeat when most of the country is looking for an alternative to Donald Trump,” Emanuel added.

Establishment Democrats are increasingly sounding the alarm amid Sanders's strong performances in the early-voting states of the 2020 primary, fearing he may be too liberal for the general election.

At least one poll from this month, however, showed the Vermont senator as the candidate in the best position to defeat President TrumpDonald John TrumpCDC updates website to remove dosage guidance on drug touted by Trump Trump says he'd like economy to reopen 'with a big bang' but acknowledges it may be limited Graham backs Trump, vows no money for WHO in next funding bill MORE in November.