Former interim Democratic National Committee (DNC) chairwoman Donna Brazile urged 2020 Democrats to unite if they want a chance at defeating President Trump in November.

"It is clear to me that one of the biggest priorities we face as the caucuses and primaries are underway [is] maintaining party unity," Brazile said Wednesday on "The Story." "We need that. We need to be focused. The only way to defeat Donald Trump is to be a unified party."

Brazile's comments come after The Hollywood Reporter published a lengthy interview with former Secretary of State and two-time presidential candidate Hillary Clinton which revealed disparaging comments made by her toward Sen. Bernie Sanders, I-Vt., in a forthcoming docuseries.

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Both during the interview about the documentary and in the documentary itself, Clinton said that "Nobody likes him [Sanders]” and “nobody wants to work with him."

Brazile, a Fox News contributor, said she was surprised by Clinton's comments but encouraged 2020 Democratic candidates to remain focused and invest their efforts in "Americans with different backgrounds."

"I believe that all of the candidates need to do a better job with reaching out to ordinary, extraordinary Americans with every different background," she said.

Two new national surveys released Wednesday point to the Democratic race turning into a two-candidate battle between Sanders and former Vice President Joe Biden. Meanwhile

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One of the surveys, published by Monmouth University, showed former New York City mayor Michael Bloomberg in fourth place, behind Biden, Sanders and Sen. Elizabeth Warren, D-Mass., a rise that Brazile attributed to Bloomberg's multi-million dollar campaign, which has helped "Democrats expand their universe."

"Two weeks ago, I could tell you that no one mentioned his name," she said. "Today his name comes up in every other sentence. He is spending a lot of money. We have seen all of his ads. More importantly, he has gone on the ground. He is speaking to black voters. Michael Bloomberg is going to have an impact on this race. How much? We don't know."

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"One thing for certain, he has been spending a lot of money, not only to build his own name, but Democrats... especially Democrats who are coming under attack from the Republicans," she added. "He is spending money to help the Democrats expand their universe."

Fox News' Paul Steinhauser contributed to this report.