Who could replace Joe Biden on the Democratic ticket?

With President Joe Biden's recent debate performance sparking concerns among Democrats, speculation has surged about potential replacements if he decides to step aside before the 2024 election. 

Despite the growing pressure from within his party, President Biden remains resolute in his decision to seek reelection. In a call with campaign staff, Biden emphasized his commitment to the race, stating, "I am running and no one’s pushing me out. I’m in this race to the end and we’re going to win." This assertion comes amid mounting doubts about his ability to secure a second term​.

Here’s a look at the key figures who could step in:

Vice President Kamala Harris

Kamala Harris is the most likely successor, given her role as vice president and her extensive political background, including her tenure as a U.S. Senator and California's Attorney General. Despite her historic achievements, she faces challenges due to her polling numbers and previous presidential campaign performance. It is important to note that Harris, despite being Biden's running mate, cannot automatically assume the top of the ticket if Biden steps down. Biden cannot simply decree that she replace him.

If Biden chooses to abandon his reelection campaign, Harris would join other top Democratic candidates vying for the nomination. This scenario would require her and others to lobby individual state delegations at the convention for their support, according to the AP.

California Governor Gavin Newsom

Gavin Newsom, the governor of California, is seen as a strong candidate due to his progressive policies and national visibility. His handling of the COVID-19 pandemic and recent policy initiatives have kept him in the national spotlight.

FILE - California Governor Gavin Newsom (L) greets US President Joe Biden during a campaign event at Long Beach City Collage in Long Beach, California on September 13, 2021.  (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images)

Michigan Governor Gretchen Whitmer

Gretchen Whitmer has gained national attention for her handling of the COVID-19 crisis and her strong stance on issues like reproductive rights and infrastructure. Her leadership in a key swing state adds to her appeal as a potential candidate.

RELATED: Whitmer to attend dinner with Biden, other Democratic governors amid brewing criticisms of president

Secretary of Transportation Pete Buttigieg

Pete Buttigieg, the former mayor of South Bend, Indiana, and current secretary of transportation, remains a notable figure within the Democratic Party. His successful 2020 presidential campaign and his work in the Biden administration position him as a potential candidate.

Illinois Governor J.B. Pritzker

J.B. Pritzker, the governor of Illinois, has been a prominent advocate for progressive policies on healthcare, labor rights, and climate change. His leadership and substantial personal wealth could make him a formidable candidate.

RELATED: Pritzker to meet with Biden at White House amid concerns

New Jersey Senator Cory Booker

Cory Booker, a U.S. senator from New Jersey, has consistently been a strong voice on criminal justice reform, economic equality, and healthcare. His experience and national recognition could help him rally support within the party.

Minnesota Senator Amy Klobuchar

Amy Klobuchar's moderate stance and strong performance in the 2020 Democratic primaries have kept her in the conversation as a potential candidate. Her focus on bipartisan solutions and effective governance could appeal to a broad spectrum of voters.

Can Biden even be replaced?

It would be nearly impossible for Democrats to replace Biden due to several key factors. Every state has already held its presidential primary. Democratic rules mandate that the delegates Biden won remain bound to support him at the party's upcoming national convention unless he tells them he’s leaving the race, according to the AP.

The conventions and their rules are controlled by the political parties. The Democratic National Committee could meet before the convention opens on Aug. 19 and change how things will work, but that isn't likely as long as Biden wants to continue seeking reelection.

While the Democratic National Committee could technically change these rules before the convention, such a move is unlikely as long as Biden continues his reelection campaign.

READ MORE: Can Joe Biden be replaced?

The Associated Press and Daniel Miller contributed to this story.