The field of Democrats who could jockey for a White House bid in 2020 is growing by the day, as more and more potential candidates are eyed as possible challengers to President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

Many potential candidates have sought to stand out from the field through vocal opposition to the Trump agenda — voting against the bipartisan two-year budget deal or calling for the president’s resignation.

Here are 36 potential candidates, from top contenders to long shots, who could run in 2020:

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Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.)

Sanders reportedly met with top advisers in late January to discuss a potential 2020 run. But Sanders said he’s focused on his reelection in 2018. Still, the 2016 Democratic primary candidate hasn’t shied away from opportunities to contrast himself to Trump. The favorite of the Democrats’ progressive wing delivered his own response to the State of the Union address, calling Trump a “bully.” If elected, Sanders would be 79 when taking office in 2021.



Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE

A recent poll of the hypothetical 2020 field showed Biden, who benefits from massive name recognition after two terms as vice president, easily leading the Democratic pack. Biden reportedly said privately that he believes he’s the only Democrat who can beat Trump in 2020. And Biden, who would be 78 in January 2021, publicly weighed the possibility of running on ABC’s “The View” in December.



Sen. Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D-N.Y.)

Gillibrand, 51, gained prominence for speaking out against sexual harassment and assault, and has sought to position herself as one of Trump’s leading Senate antagonists by frequently voting against his nominees. After Trump tweeted that she “would do anything” for campaign donations — which many thought had sexual implications — Gillibrand shot back that Trump “cannot silence me” with a “sexist smear.”



Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.)

Warren, another progressive favorite, is frequently touted as a top 2020 contender. But she’s downplayed presidential rumors and says she’s focused on her reelection in 2018. Warren, who will be 71 on Inauguration Day in 2021, was one of several Senate Democrats with possible presidential ambitions who voted against the two-year budget deal. Warren hasn’t gone as far as some colleagues, however, who have called for Trump to resign because of the sexual harassment allegations against him.



Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.)

Booker has continued to raise his profile, most recently during a contentious Senate Judiciary Committee hearing with Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE. Booker, 48, made a rousing speech accusing Nielsen of being complicit with Trump after Nielsen said she didn’t hear Trump say that the United States shouldn’t accept immigrants from “shithole countries.”



Sen. Kamala Harris Kamala HarrisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump Biden town hall draws 3.3 million viewers for CNN MORE (D-Calif.)

Harris, 53, a rising star in the party, generated national attention after she was cut off from questioning a witness at Senate Intelligence Committee hearings. But Harris, like many potential 2020 candidates, has insisted that she’s not thinking about future campaigns.



Former talk show host Oprah Winfrey

Winfrey set off presidential rumors after her speech about sexual harassment at the Golden Globes last month. But Winfrey, 64, told InStyle Magazine that she doesn’t “have the DNA for it.”



Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE

Holder is the latest politician who wouldn’t rule out a 2020 bid. When asked about a future White House run, he responded, “We’ll see.” Holder, 67, said he’s focused on his National Democratic Redistricting Committee, a Democratic effort to reverse Republican redistricting gains.



Former Housing and Urban Development Secretary Julián Castro

Castro, who was on Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE’s 2016 shortlist for vice president, will make his first foray into presidential politics with a Friday trip to New Hampshire, which holds the first presidential primary. Castro, 43, said he has “every interest in running,” and will headline the New Hampshire Young Democrats 2018 Granite Slate Awards Dinner.



Former Maryland Gov. Martin O’Malley (D)

O’Malley, 55, has already been testing the waters after an unsuccessful run in the 2016 Democratic primary.



Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.)

Delaney, 54, became the first declared presidential candidate of 2020 when he launched his campaign last July. The retiring congressman commissioned the first ad of the 2020 primaries in Iowa — which holds the first presidential caucuses.



Rep. Luis Gutiérrez (D-Ill.)

Gutiérrez, 62, is also retiring from Congress at the end of 2018, and is reportedly exploring a presidential run. The longtime congressman is a strong proponent of immigration reform, and backed an effort to introduce articles of impeachment against Trump.



Billionaire mega-donor Tom Steyer

Steyer, 60, ruled out running for office in 2018, but he hasn’t closed the door on 2020. He plans to spend $30 million to help Democrats take back the House in 2018, and is continuing his ad campaign calling for Trump’s impeachment.



Former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE

The 2004 presidential nominee has stayed out of the limelight since leaving his position as secretary of State. But recent reports say Kerry, 74, is considering another bid.



Former Virginia Gov. Terry McAuliffe (D)

McAuliffe, a potential contender close to the Clintons, could be boosted by recent Democratic gains in Virginia. McAuliffe, 61, can also draw on a large fundraising network as a former chairman of the Democratic National Committee (DNC).



Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.)

Murphy, 44, has sworn off a bid in 2020, but that hasn’t stopped the speculation about whether the leading gun control advocate will make a run.



Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.)

Klobuchar, 57, may have hurt her chances by not joining Democrats in opposing the recent budget deal for its lack of protection for “Dreamers,” but her supporters say her policy chops can’t be ruled out.



Former Missouri Secretary of State Jason Kander

After losing a surprisingly close Missouri Senate race in 2016, 36-year-old Kander has raised his national profile with a new national group meant to fight voter suppression. He’s also made the rounds at various local Democratic events, making stops in key early states.



South Bend, Ind., Mayor Pete Buttigieg (D)

Buttigieg, 36, has kept busy since making a headline-grabbing bid to chair the DNC. The openly gay Navy reservist has traveled the country to speak on panels and headline local Democratic Party events, and would offer Democrats a chance to field a midwestern politician — although he could be criticized for a lack of experience beyond the local level.



New York City Mayor Bill de Blasio (D)

Fresh off his reelection as mayor, the 56-year-old de Blasio stoked speculation about a bid with his trip to Iowa late last year. While he said that he isn’t running for president, he’s kept up rumors of a possible bid while emerging as a progressive Trump critic.



Sen. Tim Kaine Timothy (Tim) Michael KaineBiden promises Democratic senators help in battleground states Second GOP senator to quarantine after exposure to coronavirus The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Va.)

Kaine, 59, Clinton’s running mate in 2016, is expected to win reelection to the Senate. That victory could give him momentum going into 2020.



Former Massachusetts Gov. Deval Patrick (D)

Patrick, 61, has been out of office since 2015, but those close to former President Obama have reportedly urged him to run for the White House.



New York Gov. Andrew Cuomo (D)

Cuomo, 60, is one of several New Yorkers eyeing potential presidential bids in 2020. And he’s been making a name for himself through his opposition to the GOP’s tax overhaul.



Los Angeles Mayor Eric Garcetti (D)

Garcetti, 47, got some attention last year from donors, and generated some more national buzz with a recent hike with Canadian Prime Minister Justin Trudeau.



Sen. Sherrod Brown Sherrod Campbell BrownBipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (D-Ohio)

Brown is a familiar name in White House shortlists, and was considered for Clinton’s vice president pick. But Brown, 65, could face a tough reelection race this cycle in one of the 10 states that Trump won in 2016.



Dallas Mavericks owner Mark Cuban

The 59-year-old billionaire businessman and “Shark Tank” star said late last year that there’s a “10 percent” chance he runs in 2020.



Rep. Tim Ryan Timothy (Tim) RyanMourners gather outside Supreme Court after passing of Ruth Bader Ginsburg Lincoln Project hits Trump for criticizing Goodyear, 'an American company' Biden defends Goodyear after Trump urges boycott MORE (D-Ohio)

Ryan, 44, earned a high profile last year when he challenged House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Ginsburg successor must uphold commitment to 'equality, opportunity and justice for all' Bipartisan praise pours in after Ginsburg's death Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-Calif.) for her leadership post.



Montana Gov. Steve Bullock (D)

Despite Trump’s 20-point victory in Montana, Bullock, 51, was reelected to the governor’s mansion in 2016. His victory could appeal to Democrats looking to compete in deep-red states.



New Orleans Mayor Mitch Landrieu (D)

Landrieu, 57, drew national attention when he made an impassioned speech calling for the removal of Confederate statues in his hometown.



Rhode Island Gov. Gina Raimondo (D)

Raimondo, 46, the first woman to serve as Rhode Island governor, earned national exposure after she hosted the National Governors Association meeting last July.



Starbucks Executive Chairman Howard Schultz

Schultz, 64, stepped down as CEO of the popular coffee franchise in late 2016, sparking a flurry of stories that he could be considering a 2020 bid.



Facebook Chief Operating Officer Sheryl Sandberg

Sandberg’s book on corporate feminism, “Lean In,” drew high praise and raised the 48-year-old’s profile outside of Silicon Valley.



Dwayne “The Rock” Johnson

The wrestler-turned-movie star, 45, said last year that he’s “seriously considering” a bid, although he said that 2024 is a more “realistic” option.



Former Acting Attorney General Sally Yates Sally Caroline YatesButtigieg, former officials added to Biden's transition team The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Trump fires back at Yates for convention speech: 'Terrible AG' MORE

Yates became a hero to Democrats when Trump fired her for refusing to defend the travel ban. Yates, 57, said last year that she doesn’t envision herself running for office.



Colorado Gov. John Hickenlooper (D)

Hickenlooper, 66, drew some short-lived buzz over rumors he could potentially form a unity ticket in 2020 with Ohio Gov. John Kasich (R). But Hickenlooper dismissed those rumors, saying he has “no ulterior motive” for working across the aisle with Kasich.



Washington Gov. Jay Inslee (D)

The two-term governor and former congressman, 67, is expanding his network nationally as the new chairman of the Democratic Governors Association.



Ben Kamisar contributed.