Only about one-third of registered voters say they’ll vote to reelect 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 in 2020, according to a Harvard CAPS/Harris poll released exclusively to The Hill on Tuesday.

The poll found that 36 percent of voters support Trump in 2020, with 25 percent of them saying they’d definitely vote for the president. Meanwhile, 43 percent say they’d vote for an unnamed Democratic candidate in next year’s elections.

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Ten percent of voters say they would vote for an independent or another candidate, and 11 percent are undecided more than a year and half out from the 2020 elections.

Meanwhile, Trump’s approval numbers have remained steady amid the longest government shutdown in U.S. history, with 45 percent who approve of the president’s handling of the job and 55 percent who disapprove.

But the president faces a hurdle on likability. Twenty-nine percent of voters say they like him, while 58 percent dislike Trump.

“Trump’s reelection number remains low, but he is not yet facing a specific candidate,” said Mark Penn, co-director of Harvard CAPS/Harris Poll.

“A lot of voters are shopping for an alternative despite widespread approval of his economic and anti terrorism policies.”

More Democrats are jumping into the race for the 2020 nomination, and of the candidates, 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 leads in terms of voter preference, with 24 percent picking him.

Biden got 23 percent of the vote when 2016 Democratic presidential nominee 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 was removed.

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.) is steady in second place. Former Rep. Beto O’Rourke (D-Texas) is in third, but gets bumped down to fourth when Clinton is polled, with 8 percent of support.

Biden, Sanders and O’Rourke are all considering White House bids and expected to make decisions in the coming weeks.

Sens. 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.), 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.) and 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.) have all recently announced their intentions to seek the presidency. But at the time the poll was conducted, Harris wasn’t officially in the race.

When Clinton’s name isn’t factored in, Harris is right behind O’Rourke at 7 percent. Warren and Gillibrand lag in the low-single digits.

Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) and former Housing and Urban Development Secretary Julian Castro, who are also running, are at 2 percent and 1 percent, respectively.

The Harvard CAPS/Harris Poll online survey of 1,540 registered voters was conducted from Jan. 15 to 16.

The Harvard CAPS/Harris Poll is a collaboration of the Center for American Political Studies at Harvard University and The Harris Poll. The Hill will be working with Harvard/Harris Poll throughout 2019.

Full poll results will be posted online later this week. The Harvard CAPS/Harris Poll survey is an online sample drawn from the Harris Panel and weighted to reflect known demographics. As a representative online sample, it does not report a probability confidence interval.