Former Democratic National Committee Chair Donna Brazile cautioned on Wednesday that the party's top congressional leaders will need to defend their positions after November, following Abdul El-Sayed's narrow victory in Michigan's Democratic Senate primary. The result underscores a growing progressive revolt against the party's establishment.

Appearing on SiriusXM's "Straight Shooter with Stephen A.," Brazile said Senate Minority Leader Chuck Schumer (D-N.Y.) and House Minority Leader Hakeem Jeffries (D-N.Y.) will have to "fight for their leadership roles" once the midterm elections conclude. She specifically called out the need to win over lawmakers aligned with the party's left flank, naming Sens. Elizabeth Warren (D-Mass.), Cory Booker (D-N.J.), and Chris Van Hollen (D-Md.) as examples.

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El-Sayed, a physician and former Michigan health director, has positioned himself as an outsider challenging the Democratic status quo. His victory is part of a broader wave of progressive and democratic socialist candidates who have ousted incumbents in primaries across the country, with several explicitly calling for Schumer's replacement as leader.

During the campaign, El-Sayed criticized Schumer and indicated he would support Van Hollen for minority leader if elected to the Senate. Despite backing El-Sayed's opponent, Rep. Haley Stevens (D-Mich.), Schumer quickly moved to unify the party after the result, endorsing El-Sayed and issuing a joint statement with Sen. Kirsten Gillibrand (D-N.Y.), chair of the Democratic Senatorial Campaign Committee.

"Democrats are united by a common purpose: putting a check on Donald Trump by defeating his Republican enablers and taking back the Senate," the statement read. "We look forward to working with Abdul and Democrats across Michigan to win this seat in November."

The Schumer-aligned Senate Majority PAC also released a supportive video for El-Sayed, set to Journey's "Don't Stop Believin'," signaling a pragmatic embrace of the progressive candidate. El-Sayed told CNN's Kaitlan Collins that he had a "good, meaningful, heart-to-heart" phone conversation with Schumer after the race was called.

"At this point, I'm the only Democrat standing to come to the inside of the U.S. Senate, and I think we had a good, meaningful, heart-to-heart conversation about what it takes to win in a state like Michigan and what needs to be done to defeat Mike Rogers," El-Sayed said. He added that he looks forward to partnering with Schumer to win the Senate majority and "start holding Donald Trump accountable."

The Michigan primary is one of several races where progressive energy has forced the party's leadership to recalibrate. As online political influencers stir Democratic infighting, the internal tension between establishment and reformist wings is likely to persist through the general election. Meanwhile, Michigan's House primaries also set the stage for competitive November contests, adding to the state's significance.

Brazile's warning echoes broader concerns about party cohesion, especially as Republicans face their own internal divisions. For Schumer and Jeffries, the challenge will be balancing the demands of progressives with the need to win back the Senate and protect the House majority.