A Fox News poll released Wednesday showed more than half of registered voters do not believe President TrumpDonald John TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller 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 BidenHarris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act Harris voices support for Puerto Rico protesters: 'I stand with them' MORE and Sen. Bernie SandersBernie SandersBullock: I would not have endorsed health care for undocumented immigrants on debate stage Harris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act 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 Ann WarrenHarris faces pressure to define policy proposals Harris voices support for Puerto Rico protesters: 'I stand with them' Democrats slam Puerto Rico governor over 'shameful' comments, back protesters MORE (D-Mass), Sen. Cory BookerCory Anthony BookerBooker: Trump is 'worse than a racist' Cory Booker talks about 'geeking out' over Rosario Dawson's Marvel role Harris faces pressure to define policy proposals 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.