Bernie SandersBernard (Bernie) SandersPoll shows 36 percent support Trump's reelection, 43 percent prefer generic Democrat Trump's approval rating holds steady at 45 percent amid government shutdown: poll Senate Dems introduce bill to keep DACA info private MORE says it would be a "terrible idea" for Democrats to recruit Vice President Joe BidenJoseph (Joe) Robinette BidenPoll shows 36 percent support Trump's reelection, 43 percent prefer generic Democrat Trump's approval rating holds steady at 45 percent amid government shutdown: poll Hugh Hewitt: Biden has 'transgendered' into Ocasio-Cortez MORE to run for president if Hillary ClintonHillary Diane Rodham ClintonPavlich: Mueller’s indictment of the media Poll shows 36 percent support Trump's reelection, 43 percent prefer generic Democrat How the Clinton machine flooded the FBI with Trump-Russia dirt … until agents bit MORE is forced out of the race. 

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"I think that would be a terrible, terrible idea," Sanders said Friday in an interview with The Young Turks, a pro-Sanders online news show.

"That would say to the millions of people who have supported us, that have worked with us, that would say all of your energy, all of your votes, all of your beliefs are irrelevant. We're going to bring in someone else," Sanders said. 

"I happen to like Joe a lot, but I think that would be a very, very serious blunder for the Democratic Party," he added.

Biden has said often he isn't interested in running for president, citing the death of his son Beau last year as the main reason. 

Clinton leads Sanders big in the Democratic presidential race, but Sanders has vowed to stay in the race until the Democratic convention this summer.

Clinton faces a potential indictment as the FBI investigates the private email server she used while serving as secretary of State. Many onlookers are speculating that the ongoing scandal could eventually force Clinton to end her campaign.