A Fox News poll released Wednesday showed more than half of registered voters do not believe President TrumpDonald TrumpNYT: Rep. Perry played role in alleged Trump plan to oust acting AG Arizona GOP censures top state Republicans McCain, Flake and Ducey Biden and UK prime minister discuss NATO, multilateralism during call MORE will be reelected in 2020.

The poll found that 52 percent of those surveyed do not think Trump will win reelection, compared to 39 percent of registered voters surveyed who believe he will secure a second term. 

Asked who they would vote for if the election were held today, 38 percent of voters said they would support Trump, while 55 percent said they would vote for someone else.

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Thirty percent of respondents said they would “definitely” vote to reelect Trump, compared to 47 percent who indicated they would “definitely” vote for someone else, the poll found. 

A Fox News poll published in December 2010 showed 29 percent of voters thought then-President Obama would be reelected. Obama won a second term in 2012.

Wednesday's poll asked registered Democrats for their opinions on a host of potential 2020 Democratic presidential candidates. Respondents gave the highest marks to former Vice President Joe BidenJoe BidenDC residents jumped at opportunity to pay for meals for National Guardsmen Joe Biden might bring 'unity' – to the Middle East Biden shouldn't let defeating cancer take a backseat to COVID MORE and Sen. Bernie SandersBernie SandersSunday shows preview: All eyes on Biden administration to tackle coronavirus The Hill's 12:30 Report: Next steps in the Trump impeachment Sanders selling sweatshirts with his famous inauguration pose for charity MORE (I-Vt.), the poll found.

The poll surveyed 1,006 registered voters from Dec. 9-11, and has a margin of error of 3 percentage points.

Trump filed paperwork to run for reelection the day he was inaugurated in January 2017. At a press conference last month, Trump asked Vice President Pence to be his running mate in 2020 in an impromptu exchange prompted by a reporter's question.

The president has in recent months attacked a host of potential Democratic challengers in 2020, chastising Biden, Sanders, Sen. Elizabeth WarrenElizabeth WarrenStudent loan forgiveness would be windfall for dentists, doctors and lawyers OVERNIGHT ENERGY: Biden's Interior Department temporarily blocks new drilling on public lands | Group of GOP senators seeks to block Biden moves on Paris, Keystone | Judge grants preliminary approval for 0M Flint water crisis settlement Senate approves waiver for Biden's Pentagon nominee MORE (D-Mass), Sen. Cory BookerCory BookerDemocrats seek answers on impact of Russian cyberattack on Justice Department, Courts Senate confirms Biden's intel chief, giving him first Cabinet official Booker brings girlfriend, actress Rosario Dawson, to inauguration MORE (D-N.J.) and others on social media and during midterm campaign rallies.

Each of those people is said to be considering a presidential bid, but has not formally announced whether they will run.