Democratic presidential contender Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE said Friday that he would support any Democrat who wins the nomination, even if that candidate is top rival and progressive 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.).

"You’ve been saying the party has to unify to defeat Trump. Does that mean if Bernie Sanders does win the nomination, you’ll endorse him and campaign for him?” George Stephanopoulos George Robert StephanopoulosMurkowski: Supreme Court nominee should not be taken up before election Cruz says Senate Republicans likely have votes to confirm Trump Supreme Court nominee Pelosi: House will use 'every arrow in our quiver' to stop Trump Supreme Court nominee MORE asked Biden on “Good Morning America.”

"Yes, whomever wins the nomination, I’m going to endorse,” the former vice president responded.

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The remarks come a day after Biden hit out at Sanders, saying he's not a member of the Democratic Party. Sanders describes himself as a democratic socialist and represents Vermont as an Independent.

According to The New York Times, Biden emphasized that he was a Democrat in response to a question about how he would differentiate himself from his top rivals. Asked to elaborate, the former vice president drew a sharp contrast between himself and Sanders, saying, “I’m a Democrat and he says he’s not.”

Biden clarified these remarks in his interview with “Good Morning America,” emphasizing that the issue was who was best prepared to unite the party.

"Bernie is a Democrat. He calls himself a democratic socialist. We have a different view on a whole lot of things. He’s a decent guy. I don’t think he shouldn’t be running,” Biden told Stephanopoulos in Friday's interview. “The question is whether or not who’s best prepared on day one to try to reunite this party and the country as well as stand on the world stage and reassert our role in the world.”

The former vice president has previously promised to support whoever becomes the 2020 Democratic presidential nominee, vowing to “work like hell” to help any of his primary rivals defeat President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE in November’s election.

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However, Biden and Sanders have been engaged in a weeks-long feud on a number of issues, including Social Security and Biden's Iraq War vote over a decade ago.

Biden, a moderate, has argued that he is best aligned to appeal to voters in key swing states, while Sanders has maintained that a progressive is best suited to energize the liberal base.

Several polls show the two rivals locked in a tight race in Monday's Iowa caucuses. According to the RealClearPolitics average of Iowa polls, Sanders leads Biden by almost 4 percentage points with 23.8 percent support. Warren trails both candidates with 15.8 percent support.